{"title":"Horiba Parts \u0026 Accessories","description":"\u003cp\u003eReplacement sensors, electrodes, membrane caps, probe guards, cables, carrying cases, calibration solutions, and other spare parts and accessories for HORIBA water quality instruments. Compatible with the U-50 series sondes, handheld and benchtop meters, LAQUAtwin testers, and OCMA analyzers.\u003c\/p\u003e","products":[{"product_id":"horiba-u-52-sensors","title":"Horiba U-52 Sensors","description":"\u003cp\u003eKeep your field program moving without downtime. Replacement sensors for the HORIBA U-52 are designed for fast, straightforward field swaps — no complicated rebuilds and no factory service delays. Whether you are replacing a worn sensor or restoring calibration performance, you can install a new element and get back to collecting reliable water quality data the same day.\u003c\/p\u003e\n\n\u003cp\u003eThe U-52 is built so that individual sensing elements are replaced rather than the whole probe. That keeps maintenance costs down and extends the working life of the instrument considerably — a single failed pH element does not take the rest of a working sonde out of service with it.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is available\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003epH sensor\u003c\/strong\u003e (3014057312) — the standard replacement pH element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#7113 ToupH pH sensor\u003c\/strong\u003e (3200170923) — reinforced ToupH glass, more resistant to breakage and abrasion. Worth specifying for rough boreholes, silty water and high-turnover field programs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eORP sensor\u003c\/strong\u003e (3014046720) — replacement redox potential element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO sensor\u003c\/strong\u003e (3200170924) — replacement dissolved oxygen element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTurbidity sensor\u003c\/strong\u003e (3200172803) — replacement turbidity element for the U-52.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#7210 reference electrode tip\u003c\/strong\u003e (3200043582) — the reference junction. A sluggish, drifting or non-calibrating pH reading is frequently the reference tip rather than the pH element itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid junction cap, 2 pcs\u003c\/strong\u003e (3200043587) — replaceable junction caps, a low-cost wear item that should be changed on a schedule rather than on failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-pack\u003c\/strong\u003e — pH, turbidity, ORP and DO together, for a full sensor refresh in one order.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDiagnosing which sensor to replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill not calibrate, or slope out of range\u003c\/strong\u003e — replace the pH element; if the new element behaves the same way, replace the reference tip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow, drifting or noisy pH\u003c\/strong\u003e — usually the reference tip or a fouled liquid junction, not the pH glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDO reads low or responds slowly\u003c\/strong\u003e — check the membrane cap first; replace the DO element if a fresh membrane does not restore response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eORP readings implausible in a known standard\u003c\/strong\u003e — clean the metal surface, then replace the ORP element if verification against a standard still fails.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTurbidity high at zero, or unstable\u003c\/strong\u003e — inspect and clean the optics and wiper before replacing the turbidity element.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIf you need a sensor that is not listed here, please \u003ca rel=\"noopener\" title=\"Contact Envirotech\" href=\"https:\/\/envirotechonline.com\/pages\/contact\" target=\"_blank\"\u003econtact us\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eVisit the \u003ca href=\"https:\/\/envirotechonline.com\/products\/horiba-u-52\" title=\"Horiba U-52 Multiparameter Water Quality Meter\" target=\"_blank\"\u003eHoriba U-52 Multiparameter Water Quality Meter\u003c\/a\u003e page for the handheld unit and cable assemblies. DO membrane caps, probe guards, rubber caps, O-ring sets, wiper rubbers, flow cells, carrying cases and calibration solutions are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection, and the #7801 turbidity cell for the U-53 and U-53G is listed with the U-50 Series accessories.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\u003c!--Specifications button link  --\u003e\n\u003cdiv style=\"border: 1px solid lightgray; text-align: center; width: 100%; padding: 12px;\"\u003e\u003ca href=\"https:\/\/envirotechonline.com\/pages\/horiba-u-52-specifications\" style=\"font-size: 15px;\" target=\"_blank\"\u003eSPECS\u003c\/a\u003e\u003c\/div\u003e","brand":"Horiba","offers":[{"title":"pH - 3014057312","offer_id":46394324877502,"sku":"12104000","price":108.0,"currency_code":"USD","in_stock":true},{"title":"Turbidity - 3200172803","offer_id":46394324910270,"sku":"12104067","price":626.0,"currency_code":"USD","in_stock":true},{"title":"ORP  - 3014046720","offer_id":46394324943038,"sku":"12104052","price":140.0,"currency_code":"USD","in_stock":true},{"title":"DO - 3200170924","offer_id":46394324975806,"sku":"12104053","price":530.0,"currency_code":"USD","in_stock":true},{"title":"4 Pack - pH TURB ORP DO","offer_id":46394325008574,"sku":"12104000 +12104067 + 12104052 + 12104053","price":1404.0,"currency_code":"USD","in_stock":true},{"title":"#7113 ToupH pH Sensor - 3200170923","offer_id":48226490941630,"sku":"3200170923","price":151.0,"currency_code":"USD","in_stock":false},{"title":"#7210 Reference Electrode Tip - 3200043582","offer_id":48226490974398,"sku":"3200043582","price":103.0,"currency_code":"USD","in_stock":false},{"title":"Liquid Junction Cap (2 pcs) - 3200043587","offer_id":48226491007166,"sku":"3200043587","price":30.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/Screenshot2026-02-11101335.png?v=1770841396"},{"product_id":"horiba-u-50-series-replacement-sensor-probe-with-cable-assembly","title":"Horiba U-50 Series Replacement Sensor Probe with Cable Assembly","description":"\u003cp\u003eReplacement sensor probe and cable assembly for the HORIBA U-50 Series multiparameter water quality meters. This is the probe only, supplied without a control unit — so you can replace a damaged or worn probe, change cable length, or run a second probe without buying a complete meter.\u003c\/p\u003e\n\n\u003cp\u003eEach assembly ships with the probe guard and conductivity cell already fitted. It connects directly to an existing U-50 Series control unit, so a swap takes minutes in the field and gets a downed instrument back into service the same day.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSensor probe with integrated cable assembly\u003c\/li\u003e\n\u003cli\u003eSensor probe guard\u003c\/li\u003e\n\u003cli\u003eConductivity cell\u003c\/li\u003e\n\u003cli\u003eWater depth sensor — U-52G and U-53\/U-53G assemblies only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eChoosing the right probe\u003c\/h3\u003e\n\u003cp\u003eMatch the assembly to your control unit model, then pick the cable length for your deepest measuring point: \u003cstrong\u003e2 m\u003c\/strong\u003e for surface water, flow cells and beaker work, \u003cstrong\u003e10 m\u003c\/strong\u003e for typical shallow monitoring wells, \u003cstrong\u003e30 m\u003c\/strong\u003e for deep wells, reservoirs and full water-column profiling. The U-53 and U-53G share a single probe assembly.\u003c\/p\u003e\n\n\u003ch3\u003ePart numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-51\u003c\/strong\u003e — 2 m: 3200237465  |  10 m: 3200237464\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-52\u003c\/strong\u003e — 2 m: 3200237467  |  10 m: 3200237466  |  30 m: 3200237468 (available on request — contact us for pricing)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-52G\u003c\/strong\u003e — 2 m: 3200237470  |  10 m: 3200237469  |  30 m: 3200237471\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-53 \/ U-53G\u003c\/strong\u003e — 2 m: 3200237473  |  10 m: 3200237472  |  30 m: 3200237474\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacing a probe damaged by impact, abrasion or cable failure\u003c\/li\u003e\n\u003cli\u003eExtending reach by moving from a 2 m to a 10 m or 30 m cable\u003c\/li\u003e\n\u003cli\u003eKeeping a spare probe on the shelf to avoid downtime during a sampling event\u003c\/li\u003e\n\u003cli\u003eRunning a dedicated probe per site to reduce cross-contamination risk\u003c\/li\u003e\n\u003cli\u003eRestoring a U-50 Series meter whose control unit is still serviceable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/pdf\/water_quality\/horiba_u-50.pdf\"\u003eU-50 Series specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50_Manual_revised_0409.pdf\"\u003eU-50 Series instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50_Flow_Cell_Instruction_Manual.pdf\"\u003eU-50FC flow cell instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eIndividual replacement sensors, turbidity cells, membrane caps, probe guards and O-rings are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Complete meters and control units are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA\u003c\/a\u003e collection.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"U-51 - 2 Meter Cable - 3200237465","offer_id":48226007875774,"sku":"3200237465","price":2524.0,"currency_code":"USD","in_stock":true},{"title":"U-51 - 10 Meter Cable - 3200237464","offer_id":48226007908542,"sku":"3200237464","price":2730.0,"currency_code":"USD","in_stock":true},{"title":"U-52 - 2 Meter Cable - 3200237467","offer_id":48226007941310,"sku":"3200237467","price":3122.0,"currency_code":"USD","in_stock":true},{"title":"U-52 - 10 Meter Cable - 3200237466","offer_id":48226007974078,"sku":"3200237466","price":3405.0,"currency_code":"USD","in_stock":true},{"title":"U-52G - 2 Meter Cable - 3200237470","offer_id":48226008006846,"sku":"3200237470","price":3194.0,"currency_code":"USD","in_stock":true},{"title":"U-52G - 10 Meter Cable - 3200237469","offer_id":48226008039614,"sku":"3200237469","price":3194.0,"currency_code":"USD","in_stock":true},{"title":"U-52G - 30 Meter Cable - 3200237471","offer_id":48226008072382,"sku":"3200237471","price":3660.0,"currency_code":"USD","in_stock":true},{"title":"U-53 \/ U-53G - 2 Meter Cable - 3200237473","offer_id":48226008105150,"sku":"3200237473","price":4465.0,"currency_code":"USD","in_stock":true},{"title":"U-53 \/ U-53G - 10 Meter Cable - 3200237472","offer_id":48226008137918,"sku":"3200237472","price":4696.0,"currency_code":"USD","in_stock":true},{"title":"U-53 \/ U-53G - 30 Meter Cable - 3200237474","offer_id":48226008170686,"sku":"3200237474","price":5115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_U-50_01_e75a8359d0.jpg?v=1785336941"},{"product_id":"horiba-u-50-series-control-unit","title":"Horiba U-50 Series Control Unit","description":"\u003cp\u003eReplacement handheld control unit for the HORIBA U-50 Series multiparameter water quality meters. Supplied without a sensor probe — replace only the display unit and keep the probe you already own, or add a second control unit so two crews can share one set of probes.\u003c\/p\u003e\n\n\u003cp\u003eThe control unit is the display, keypad and data logger of the U-50 system. It shows every measured parameter simultaneously, stores readings in internal memory, and downloads to a PC using the U-50PC data collection software.\u003c\/p\u003e\n\n\u003ch3\u003eTwo versions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-5000\u003c\/strong\u003e (part no. 3200324195) — standard control unit, no GPS. Use with U-51, U-52 and U-53 sensor probes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-5000G\u003c\/strong\u003e (part no. 3200324196) — built-in GPS tags every stored reading with latitude and longitude. Required for U-52G and U-53G probes, and the way to add GPS logging to an existing U-50 system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacing a control unit lost or damaged in the field\u003c\/li\u003e\n\u003cli\u003eUpgrading an existing U-50 meter to GPS-tagged data logging\u003c\/li\u003e\n\u003cli\u003eRunning a spare display unit to avoid downtime mid-project\u003c\/li\u003e\n\u003cli\u003eRebuilding a meter whose sensor probe is still serviceable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/pdf\/water_quality\/horiba_u-50.pdf\"\u003eU-50 Series specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50_Manual_revised_0409.pdf\"\u003eU-50 Series instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50PC_Instruction_Manual.pdf\"\u003eU-50PC software instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eParts \u0026amp; accessories\u003c\/h3\u003e\n\u003cp\u003eSensor probes, replacement pH, ORP, DO and turbidity sensors, communication cables, external power supplies and carrying cases are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"U-5000 - Without GPS - 3200324195","offer_id":48226009776318,"sku":"3200324195","price":1356.0,"currency_code":"USD","in_stock":true},{"title":"U-5000G - With GPS - 3200324196","offer_id":48226009809086,"sku":"3200324196","price":2035.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_U-50_01_e75a8359d0_d43c0b58-e096-44de-852c-b48fd60daad6.jpg?v=1785336943"},{"product_id":"horiba-u-50-series-accessories-amp-spare-parts","title":"Horiba U-50 Series Accessories \u0026 Spare Parts","description":"\u003cp\u003eConsumables, spare parts and field accessories for the HORIBA U-50 Series multiparameter water quality meters — U-51, U-52, U-52G, U-53 and U-53G. Select the item you need from the dropdown. Every part is genuine HORIBA and fits the U-50 Series directly, with no adapters or modification.\u003c\/p\u003e\n\n\u003cp\u003eThese are the items that keep a U-50 running season after season: the DO membrane caps and protective covers that wear out with use, the probe guards and rubber caps that absorb impact in rough boreholes, the wiper rubbers that keep turbidity optics clean, the O-rings that maintain the waterproof seal at every sensor port, and the standard solutions needed for routine calibration.\u003c\/p\u003e\n\n\u003ch3\u003eConsumables \u0026amp; seals\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDO membrane caps (3 pcs) — 3200170194\u003c\/li\u003e\n\u003cli\u003eDO sensor protective covers (3 pcs) — 3200175020\u003c\/li\u003e\n\u003cli\u003epH sensor protective covers (3 pcs) — 3200175019\u003c\/li\u003e\n\u003cli\u003eO-ring set for pH\/ORP sensor (10 pcs) — 3200169520\u003c\/li\u003e\n\u003cli\u003epH electrode O-ring — 3030053468\u003c\/li\u003e\n\u003cli\u003eDO electrode O-ring — 3030054233\u003c\/li\u003e\n\u003cli\u003eReference electrode O-ring — 3030049447\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProbe guards \u0026amp; hardware\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProbe guard, stainless steel — 3200167002\u003c\/li\u003e\n\u003cli\u003eProbe guard, plastic with holes (no rubber cap) — 3200160840\u003c\/li\u003e\n\u003cli\u003eRubber cap for probe guard — 3200054596\u003c\/li\u003e\n\u003cli\u003eRubber cap set for sensor guard (8 pcs) — 3200169428\u003c\/li\u003e\n\u003cli\u003eWiper rubber (3 pcs) — 3200169789\u003c\/li\u003e\n\u003cli\u003eDO spanner — 3200098516\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCases, cells \u0026amp; power\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eU-5030 carrying case — 5200529244\u003c\/li\u003e\n\u003cli\u003eFlow-through cell — 3200156570\u003c\/li\u003e\n\u003cli\u003eCalibration beaker — 3200156572\u003c\/li\u003e\n\u003cli\u003eKU-20-2 USB communication cable, 2 m, with software — 3200174823\u003c\/li\u003e\n\u003cli\u003eU-50EP external power supply — 3200358528\u003c\/li\u003e\n\u003cli\u003eUSB connector, leak test (ETO) — 3200225292\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eStandard solutions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e140-4 pH 4 standard solution (4 L) — 3200174430\u003c\/li\u003e\n\u003cli\u003e#306 DO international standard solution (50 ml) — 3200170938\u003c\/li\u003e\n\u003cli\u003e330 reference electrode internal solution, 3.33 mol\/L KCl gel (250 ml) — 3200043641\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation packages\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTraceability certificate — U-50 meter unit\u003c\/li\u003e\n\u003cli\u003eTraceability certificate — #7112 pH sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach package includes a test report, traceability certificate and NIST traceability chart.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine preventive maintenance and pre-season instrument servicing\u003c\/li\u003e\n\u003cli\u003eReplacing consumable DO membranes and caps between sampling events\u003c\/li\u003e\n\u003cli\u003eRestoring the waterproof seal after a sensor change or O-ring failure\u003c\/li\u003e\n\u003cli\u003eLow-flow groundwater sampling using the flow-through cell\u003c\/li\u003e\n\u003cli\u003eExtended deployments and continuous monitoring using external power\u003c\/li\u003e\n\u003cli\u003eCalibration and QC verification before regulatory sampling\u003c\/li\u003e\n\u003cli\u003eSupplying documentation for audited or accredited monitoring programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/pdf\/water_quality\/horiba_u-50.pdf\"\u003eU-50 Series specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50_Manual_revised_0409.pdf\"\u003eU-50 Series instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50PC_Instruction_Manual.pdf\"\u003eU-50PC software instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.geotechenv.com\/Manuals\/Horiba_Manuals\/U-50_Flow_Cell_Instruction_Manual.pdf\"\u003eU-50FC flow cell instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eReplacement pH, ORP, DO and turbidity sensors and complete probe assemblies are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Complete meters and control units are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA\u003c\/a\u003e collection.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"DO Membrane Cap (3 pcs) - 3200170194","offer_id":48226010202302,"sku":"3200170194","price":130.0,"currency_code":"USD","in_stock":true},{"title":"DO Sensor Protective Cover (3 pcs) - 3200175020","offer_id":48226010235070,"sku":"3200175020","price":33.0,"currency_code":"USD","in_stock":true},{"title":"#306 DO International Standard Solution (50 ml) - 3200170938","offer_id":48226010267838,"sku":"3200170938","price":49.0,"currency_code":"USD","in_stock":true},{"title":"pH Sensor Protective Cover (3 pcs) - 3200175019","offer_id":48226010300606,"sku":"3200175019","price":35.0,"currency_code":"USD","in_stock":true},{"title":"U-5030 Carrying Case - 5200529244","offer_id":48226010333374,"sku":"5200529244","price":620.0,"currency_code":"USD","in_stock":true},{"title":"KU-20-2 USB Communication Cable 2 m with Software - 3200174823","offer_id":48226010366142,"sku":"3200174823","price":135.0,"currency_code":"USD","in_stock":true},{"title":"Flow Through Cell - 3200156570","offer_id":48226010398910,"sku":"3200156570","price":853.0,"currency_code":"USD","in_stock":true},{"title":"Probe Guard - Stainless Steel - 3200167002","offer_id":48226010431678,"sku":"3200167002","price":1242.0,"currency_code":"USD","in_stock":true},{"title":"Probe Guard - Plastic with Holes (no rubber cap) - 3200160840","offer_id":48226010464446,"sku":"3200160840","price":36.0,"currency_code":"USD","in_stock":true},{"title":"Rubber Cap for Probe Guard - 3200054596","offer_id":48226010497214,"sku":"3200054596","price":21.0,"currency_code":"USD","in_stock":true},{"title":"Calibration Beaker - 3200156572","offer_id":48226010529982,"sku":"3200156572","price":43.0,"currency_code":"USD","in_stock":true},{"title":"Rubber Cap Set for Sensor Guard (8 pcs) - 3200169428","offer_id":48226010562750,"sku":"3200169428","price":59.0,"currency_code":"USD","in_stock":true},{"title":"Wiper Rubber (3 pcs) - 3200169789","offer_id":48226010595518,"sku":"3200169789","price":79.0,"currency_code":"USD","in_stock":true},{"title":"U-50EP External Power Supply - 3200358528","offer_id":48226010628286,"sku":"3200358528","price":453.0,"currency_code":"USD","in_stock":true},{"title":"USB Connector - Leak Test (ETO) - 3200225292","offer_id":48226010661054,"sku":"3200225292","price":221.0,"currency_code":"USD","in_stock":true},{"title":"140-4 pH 4 Standard Solution (4 L) - 3200174430","offer_id":48226010693822,"sku":"3200174430","price":210.0,"currency_code":"USD","in_stock":true},{"title":"330 Reference Electrode Internal Solution 3.33 mol\/L KCl Gel (250 ml) - 3200043641","offer_id":48226010726590,"sku":"3200043641","price":43.0,"currency_code":"USD","in_stock":true},{"title":"DO Spanner - 3200098516","offer_id":48226010759358,"sku":"3200098516","price":49.0,"currency_code":"USD","in_stock":true},{"title":"O-Ring Set for pH\/ORP Sensor (10 pcs) - 3200169520","offer_id":48226010792126,"sku":"3200169520","price":56.0,"currency_code":"USD","in_stock":true},{"title":"pH Electrode O-Ring - 3030053468","offer_id":48226010824894,"sku":"3030053468","price":5.5,"currency_code":"USD","in_stock":true},{"title":"DO Electrode O-Ring - 3030054233","offer_id":48226010857662,"sku":"3030054233","price":5.5,"currency_code":"USD","in_stock":true},{"title":"Reference Electrode O-Ring - 3030049447","offer_id":48226010890430,"sku":"3030049447","price":5.5,"currency_code":"USD","in_stock":true},{"title":"Traceability Certificate - U-50 Meter Unit","offer_id":48226010923198,"sku":null,"price":140.0,"currency_code":"USD","in_stock":true},{"title":"Traceability Certificate - #7112 pH Sensor","offer_id":48226010955966,"sku":null,"price":140.0,"currency_code":"USD","in_stock":true},{"title":"#7801 Turbidity Cell for U-53 \/ U-53G - 3200172800","offer_id":48226491039934,"sku":"3200172800","price":810.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_U-50_01_e75a8359d0_3aacb183-8234-478b-8f47-b9060ee68386.jpg?v=1785336957"},{"product_id":"horiba-laquatwin-replacement-sensor","title":"Horiba LAQUAtwin Replacement Sensor","description":"\u003cp\u003eGenuine HORIBA replacement sensors for LAQUAtwin pocket water quality meters. The flat sensor is a consumable part — when readings drift, calibration will no longer hold, or response becomes sluggish, you replace the sensor rather than the meter. Swapping one takes seconds with no tools.\u003c\/p\u003e\n\n\u003cp\u003eSensor life depends on how often the meter is used and what it is used on. Expect to replace pH and conductivity sensors roughly annually with regular use, and sooner where samples are dirty, high in solids, or chemically aggressive. Keeping a spare on the shelf means a worn sensor never costs you a day's work.\u003c\/p\u003e\n\n\u003ch3\u003eSelect the sensor for your meter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS010\u003c\/strong\u003e (part no. 3200459834) — pH sensor for pH-11, pH-22 and pH-33\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS070\u003c\/strong\u003e (part no. 3200459672) — conductivity sensor for EC-11, EC-22 and EC-33\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS071\u003c\/strong\u003e (part no. 3200597237) — conductivity-based salt sensor for Salt-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS021\u003c\/strong\u003e (part no. 3200459866) — sodium ISE salt sensor for Salt-22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS022\u003c\/strong\u003e (part no. 3200459867) — sodium sensor for Na-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS030\u003c\/strong\u003e (part no. 3200459868) — potassium sensor for K-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS040\u003c\/strong\u003e (part no. 3200459870) — nitrate sensor for NO3-11, NO3-11C and NO3-11S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS050\u003c\/strong\u003e (part no. 3200459869) — calcium sensor for Ca-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS051\u003c\/strong\u003e (part no. 3200772945) — calcium sensor for Ca-11C blood calcium meter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS060\u003c\/strong\u003e (part no. 3200934450) — fluoride sensor for F-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS060-ORP\u003c\/strong\u003e (part no. 3200997083) — ORP sensor for ORP-11\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSensors are model-specific and not interchangeable between parameters — match the sensor code to your meter.\u003c\/li\u003e\n\u003cli\u003eIon-selective sensors (Na, K, NO3, Ca, F) need electrode conditioning before first use: apply a few drops of the high standard solution to the flat sensor and leave it several hours, then calibrate.\u003c\/li\u003e\n\u003cli\u003eRecalibrate with fresh standard solution immediately after fitting any new sensor.\u003c\/li\u003e\n\u003cli\u003eTake care not to twist the waterproof gasket when fitting, or the meter will lose its IP67 rating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Brochures\/Pocket_Meters\/Brochure_-_PBT-02-2017A_LAQUAtwin_Pocket_Water_Quality_Meter_-_LOWRES.pdf\"\u003eLAQUAtwin pocket meter brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Instruction_Manuals\/Pocket_Meters\/A-IM_-_LAQUAtwin_ISE_ALL.pdf\"\u003eLAQUAtwin ion meter instruction manual, Ca-11 \/ K-11 \/ Na-11 \/ NO3-11 (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eStandard and calibration solution sets, sampling sheets and carrying cases are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Complete meters are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA\u003c\/a\u003e collection.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"S010 - pH sensor for pH-11\/22\/33 - 3200459834","offer_id":48226183053502,"sku":"3200459834","price":90.0,"currency_code":"USD","in_stock":true},{"title":"S070 - Conductivity sensor for EC-11\/22\/33 - 3200459672","offer_id":48226183086270,"sku":"3200459672","price":90.0,"currency_code":"USD","in_stock":true},{"title":"S071 - Salt sensor for Salt-11 - 3200597237","offer_id":48226183119038,"sku":"3200597237","price":90.0,"currency_code":"USD","in_stock":true},{"title":"S021 - Sodium ISE salt sensor for Salt-22 - 3200459866","offer_id":48226183151806,"sku":"3200459866","price":173.0,"currency_code":"USD","in_stock":true},{"title":"S022 - Sodium sensor for Na-11 - 3200459867","offer_id":48226183184574,"sku":"3200459867","price":173.0,"currency_code":"USD","in_stock":true},{"title":"S030 - Potassium sensor for K-11 - 3200459868","offer_id":48226183217342,"sku":"3200459868","price":173.0,"currency_code":"USD","in_stock":true},{"title":"S040 - Nitrate sensor for NO3-11\/11C\/11S - 3200459870","offer_id":48226183250110,"sku":"3200459870","price":173.0,"currency_code":"USD","in_stock":true},{"title":"S050 - Calcium sensor for Ca-11 - 3200459869","offer_id":48226183282878,"sku":"3200459869","price":173.0,"currency_code":"USD","in_stock":true},{"title":"S051 - Calcium sensor for Ca-11C blood calcium meter - 3200772945","offer_id":48226183315646,"sku":"3200772945","price":260.0,"currency_code":"USD","in_stock":true},{"title":"S060 - Fluoride sensor for F-11 - 3200934450","offer_id":48226183348414,"sku":"3200934450","price":240.0,"currency_code":"USD","in_stock":true},{"title":"S060-ORP - ORP sensor for ORP-11 - 3200997083","offer_id":48226183381182,"sku":"3200997083","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Sensor_Ca__5b8979c775.jpg?v=1785337037"},{"product_id":"horiba-laquatwin-standard-amp-calibration-solutions","title":"Horiba LAQUAtwin Standard \u0026 Calibration Solutions","description":"\u003cp\u003eGenuine HORIBA standard and calibration solutions for LAQUAtwin pocket meters. Most are supplied as sets of six 14 mL sachets — a single-use format that keeps every calibration traceable to fresh, uncontaminated standard. Once a sachet is opened it is used and discarded, so there is no bottle sitting on a shelf slowly absorbing carbon dioxide or growing biofilm.\u003c\/p\u003e\n\n\u003cp\u003eCalibration is only as good as the standard behind it. Standards drift with age and contaminate quickly once opened, and a meter calibrated against a degraded standard reads confidently wrong. The sachet format removes that failure mode entirely, which is why it matters for any measurement that has to stand up to scrutiny.\u003c\/p\u003e\n\n\u003ch3\u003epH and conductivity\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-4\u003c\/strong\u003e (3999960108) — pH 4 standard, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-7\u003c\/strong\u003e (3999960109) — pH 7 standard, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-22\u003c\/strong\u003e (3999960110) — conductivity 1.41 mS\/cm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-23\u003c\/strong\u003e (3999960111) — conductivity 12.9 mS\/cm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-20\u003c\/strong\u003e (3999960114) — moistening solution, for sensor storage and conditioning\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSalt and ORP\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-05\u003c\/strong\u003e (3999960112) — salt 5 ppt \/ 0.5%, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-50\u003c\/strong\u003e (3999960113) — salt 50 ppt \/ 5.0%, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-ORP-225\u003c\/strong\u003e (3200997084) — ORP 255 mV standard, 6 × 14 mL\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNitrate\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eY044\u003c\/strong\u003e (3200053535) — nitrate 30 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY045\u003c\/strong\u003e (3200053536) — nitrate 150 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY042\u003c\/strong\u003e (3200053514) — nitrate 300 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY043\u003c\/strong\u003e (3200053532) — nitrate 2000 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY041\u003c\/strong\u003e (3200053433) — nitrate 5000 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSodium, potassium and calcium\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eY022L\u003c\/strong\u003e (3200457724) — sodium 150 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY022H\u003c\/strong\u003e (3200457723) — sodium 2000 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY031L\u003c\/strong\u003e (3200457720) — potassium 150 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY031H\u003c\/strong\u003e (3200457719) — potassium 2000 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY051L\u003c\/strong\u003e (3200457728) — calcium 150 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY051H\u003c\/strong\u003e (3200457727) — calcium 2000 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFluoride\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-F-1\u003c\/strong\u003e (3200991628) — fluoride 1 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-F-10\u003c\/strong\u003e (3200991630) — fluoride 10 ppm, 6 × 14 mL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e514-F-TISAB\u003c\/strong\u003e (3200991632) — total ionic strength adjustment buffer, 6 × 14 mL. Required for accurate fluoride measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCa-11C blood calcium consumables\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eY053\u003c\/strong\u003e (3200774921) — complete standard solution kit: 2 × Y052L, 2 × Y052H and 3 × #251 cleaning solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY052L\u003c\/strong\u003e (3200774598) — 1.25 mmol\/L standard, 2 × 25 mL bottles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eY052H\u003c\/strong\u003e (3200774599) — 2.50 mmol\/L standard, 2 × 25 mL bottles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#251\u003c\/strong\u003e (3200774601) — cleaning solution, 250 mL bottle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCalibration guidance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCalibrate with two standards that bracket your expected sample range for best accuracy.\u003c\/li\u003e\n\u003cli\u003eRecalibrate after fitting a new sensor, and routinely at the start of each measuring session.\u003c\/li\u003e\n\u003cli\u003eUse the high standard for ion-selective sensor conditioning before first use.\u003c\/li\u003e\n\u003cli\u003eFluoride measurements require TISAB to control ionic strength and remove interference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Brochures\/Pocket_Meters\/Brochure_-_PBT-02-2017A_LAQUAtwin_Pocket_Water_Quality_Meter_-_LOWRES.pdf\"\u003eLAQUAtwin pocket meter brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eReplacement sensors, sampling sheets and carrying cases are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Complete meters are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA\u003c\/a\u003e collection.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"514-4 - pH 4 standard (6 x 14 ml) - 3999960108","offer_id":48226192588990,"sku":"3999960108","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-7 - pH 7 standard (6 x 14 ml) - 3999960109","offer_id":48226192621758,"sku":"3999960109","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-22 - Conductivity 1.41 mS\/cm (6 x 14 ml) - 3999960110","offer_id":48226192654526,"sku":"3999960110","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-23 - Conductivity 12.9 mS\/cm (6 x 14 ml) - 3999960111","offer_id":48226192687294,"sku":"3999960111","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-20 - Moistening solution - 3999960114","offer_id":48226192720062,"sku":"3999960114","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-05 - Salt 5 ppt \/ 0.5% (6 x 14 ml) - 3999960112","offer_id":48226192752830,"sku":"3999960112","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-50 - Salt 50 ppt \/ 5.0% (6 x 14 ml) - 3999960113","offer_id":48226192785598,"sku":"3999960113","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-ORP-225 - ORP 255 mV standard (6 x 14 ml) - 3200997084","offer_id":48226192818366,"sku":"3200997084","price":73.0,"currency_code":"USD","in_stock":true},{"title":"Y044 - Nitrate 30 ppm (6 x 14 ml) - 3200053535","offer_id":48226192851134,"sku":"3200053535","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y045 - Nitrate 150 ppm (6 x 14 ml) - 3200053536","offer_id":48226192883902,"sku":"3200053536","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y042 - Nitrate 300 ppm (6 x 14 ml) - 3200053514","offer_id":48226192916670,"sku":"3200053514","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y043 - Nitrate 2000 ppm (6 x 14 ml) - 3200053532","offer_id":48226192949438,"sku":"3200053532","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y041 - Nitrate 5000 ppm (6 x 14 ml) - 3200053433","offer_id":48226192982206,"sku":"3200053433","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y022L - Sodium 150 ppm (6 x 14 ml) - 3200457724","offer_id":48226193014974,"sku":"3200457724","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y022H - Sodium 2000 ppm (6 x 14 ml) - 3200457723","offer_id":48226193047742,"sku":"3200457723","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y031L - Potassium 150 ppm (6 x 14 ml) - 3200457720","offer_id":48226193080510,"sku":"3200457720","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y031H - Potassium 2000 ppm (6 x 14 ml) - 3200457719","offer_id":48226193113278,"sku":"3200457719","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y051L - Calcium 150 ppm (6 x 14 ml) - 3200457728","offer_id":48226193146046,"sku":"3200457728","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Y051H - Calcium 2000 ppm (6 x 14 ml) - 3200457727","offer_id":48226193178814,"sku":"3200457727","price":60.0,"currency_code":"USD","in_stock":true},{"title":"514-F-1 - Fluoride 1 ppm (6 x 14 ml) - 3200991628","offer_id":48226193211582,"sku":"3200991628","price":64.0,"currency_code":"USD","in_stock":true},{"title":"514-F-10 - Fluoride 10 ppm (6 x 14 ml) - 3200991630","offer_id":48226193244350,"sku":"3200991630","price":64.0,"currency_code":"USD","in_stock":true},{"title":"514-F-TISAB - Ionic strength adjustor (6 x 14 ml) - 3200991632","offer_id":48226193277118,"sku":"3200991632","price":64.0,"currency_code":"USD","in_stock":true},{"title":"Y053 - Ca-11C standard solution kit - 3200774921","offer_id":48226193309886,"sku":"3200774921","price":454.0,"currency_code":"USD","in_stock":true},{"title":"Y052L - 1.25 mmol\/L blood calcium standard (2 x 25 ml) - 3200774598","offer_id":48226193342654,"sku":"3200774598","price":150.0,"currency_code":"USD","in_stock":true},{"title":"Y052H - 2.50 mmol\/L blood calcium standard (2 x 25 ml) - 3200774599","offer_id":48226193375422,"sku":"3200774599","price":150.0,"currency_code":"USD","in_stock":true},{"title":"#251 - Cleaning solution (250 ml) - 3200774601","offer_id":48226193408190,"sku":"3200774601","price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_514-20_bf7ae4a520.png?v=1785337041"},{"product_id":"horiba-laquatwin-accessories","title":"Horiba LAQUAtwin Accessories","description":"\u003cp\u003eAccessories for HORIBA LAQUAtwin pocket water quality meters — the sampling sheets that let you measure genuinely tiny samples, the holder that makes them easy to use one-handed, and the hard case for carrying a set of meters into the field.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable items\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSampling sheet B, Y046\u003c\/strong\u003e (part no. 3200053858) — pack of 100. Absorbent sheets that drop the minimum sample volume to about 0.05 mL, roughly a third of what the bare sensor needs. Press the sheet against a leaf, a soil surface or a damp material and lay it on the sensor to read.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSampling sheet holder, Y048\u003c\/strong\u003e (part no. 3200459736) — reusable holder that grips a sampling sheet so you can take a sample and transfer it to the meter without touching the sheet. Fits the whole LAQUAtwin range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLAQUAtwin carrying case\u003c\/strong\u003e (part no. 5700012843) — hard case sized for up to six meters plus their standard solutions. For crews running several parameters at once.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy sampling sheets are useful\u003c\/h3\u003e\n\u003cp\u003eThe flat sensor already works from a drop, but some samples will not give you even that — a leaf surface, a moist soil crumb, a swab from equipment, or a residue you cannot dilute without changing the result. The sampling sheet absorbs a small amount of liquid and presents it to the sensor as a usable sample. It also filters out fine particulates that would otherwise sit on the sensor and skew the reading, which matters with soil extracts in particular.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSoil and plant sap testing where sample volume is minimal\u003c\/li\u003e\n\u003cli\u003eSurface and swab testing on equipment, produce and packaging\u003c\/li\u003e\n\u003cli\u003eField crews carrying multiple LAQUAtwin parameters in one case\u003c\/li\u003e\n\u003cli\u003eTeaching labs running many small samples in sequence\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Brochures\/Pocket_Meters\/Brochure_-_PBT-02-2017A_LAQUAtwin_Pocket_Water_Quality_Meter_-_LOWRES.pdf\"\u003eLAQUAtwin pocket meter brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eReplacement sensors and standard solutions are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Complete meters are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA\u003c\/a\u003e collection.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Y046 - Sampling sheet B (100 pcs) - 3200053858","offer_id":48226199142590,"sku":"3200053858","price":76.0,"currency_code":"USD","in_stock":true},{"title":"Y048 - Sampling sheet holder - 3200459736","offer_id":48226199175358,"sku":"3200459736","price":60.0,"currency_code":"USD","in_stock":true},{"title":"Carrying case for up to 6 meters with standard solutions - 5700012843","offer_id":48226199208126,"sku":"5700012843","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_INT-image-Pocket-Meter-Meter_EC-11_closed_0dfb4c4687_2a86526b-0430-4ac7-8336-c3d9f149aba8.jpg?v=1785353601"},{"product_id":"horiba-sr-305-solvent-reclaimer-for-ocma-analyzers","title":"Horiba SR-305 Solvent Reclaimer for OCMA Analyzers","description":"\u003cp\u003eThe HORIBA SR-305 solvent reclaimer recovers used S-316 extraction solvent so it can be measured again, cutting the largest ongoing running cost of operating an OCMA oil content analyzer.\u003c\/p\u003e\n\n\u003cp\u003eSpent solvent is passed through a column of activated carbon and activated alumina, which strips the extracted oil and moisture and returns solvent clean enough for reuse. For any lab running OCMA analyses regularly, the reclaimer typically pays for itself in avoided solvent purchases — and it reduces the volume of solvent waste you have to store, document and dispose of.\u003c\/p\u003e\n\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cp\u003eA water separation filter removes carried-over water first, then the sample passes through the activated carbon container where oil is adsorbed, and finally through activated alumina for final drying and polishing. Filters, carbon and alumina are all replaceable consumables — replace them on schedule and reclaimed solvent quality stays consistent.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with the OCMA-500 and OCMA-550 (and earlier OCMA models using S-316). Part number 3014102236.\u003c\/p\u003e\n\n\u003ch3\u003eWhy reclaim solvent\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstantially reduces S-316 purchase volume and cost per analysis\u003c\/li\u003e\n\u003cli\u003eReduces hazardous solvent waste generation and disposal cost\u003c\/li\u003e\n\u003cli\u003eLess solvent inventory to store and manage on site\u003c\/li\u003e\n\u003cli\u003eShorter lead-time exposure — you are less dependent on solvent delivery schedules\u003c\/li\u003e\n\u003cli\u003eSmaller environmental footprint per sample analyzed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eConsumables for the reclaimer\u003c\/h3\u003e\n\u003cp\u003eThe SR-305 needs periodic replacement of water separation filters, carbon container filters, activated carbon, activated alumina and the O-rings that hold the filters in place. All are stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Keeping a spare set on the shelf avoids interrupting reclaim cycles.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Products\/Process_and_Environmental\/Water_Pollution\/Brochures\/OCMA-500\/OCMA-500_HAE-T0254B.pdf\"\u003eOCMA-500\/550 brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/int\/water-liquid\/products\/series\/oil-content-analyzer\/\"\u003eHORIBA oil content analyzer series\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"SR-305 Solvent Reclaimer - 3014102236","offer_id":48226227191998,"sku":"3014102236","price":2190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_OCMA_674df7157d.jpg?v=1785353565"},{"product_id":"horiba-s-316-extraction-solvent-for-ocma-oil-content-analyzers","title":"Horiba S-316 Extraction Solvent for OCMA Oil Content Analyzers","description":"\u003cp\u003eS-316 is the extraction solvent used to pull oil out of a sample so it can be measured by infrared absorption in a HORIBA OCMA oil content analyzer. It is the required solvent for the international OCMA models and is supplied in 1.5 kg bottles.\u003c\/p\u003e\n\n\u003cp\u003eS-316 is not regulated under the Montreal Protocol (Ozone Layer Protection Act), which is a meaningful practical advantage over older chlorofluorocarbon extraction solvents: it avoids the procurement restrictions, reporting obligations and phase-out risk attached to controlled substances. It is also the reason the OCMA method remains viable for laboratories that can no longer obtain legacy solvents.\u003c\/p\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eFor use with the OCMA-500, OCMA-550, and the earlier OCMA-300 and OCMA-350 analyzers. Part number 5200100690.\u003c\/p\u003e\n\u003cp\u003eNote: the domestic Japanese OCMA-505-H and OCMA-555-H models use solvent H-519 instead. If you have one of those, S-316 is not the correct solvent — contact us.\u003c\/p\u003e\n\n\u003ch3\u003eVolume pricing\u003c\/h3\u003e\n\u003cp\u003eTiered pricing is available on larger orders — quantity breaks apply at \u003cstrong\u003e26 bottles and above\u003c\/strong\u003e and again at \u003cstrong\u003e100 bottles and above\u003c\/strong\u003e. The price shown is for standard quantities; contact us for a quotation on bulk or annual-supply orders.\u003c\/p\u003e\n\n\u003ch3\u003eReduce your solvent consumption\u003c\/h3\u003e\n\u003cp\u003eSolvent is the dominant running cost of OCMA analysis. Two things reduce it: the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eSR-305 solvent reclaimer\u003c\/a\u003e, which recovers spent S-316 through a carbon and alumina column so it can be reused, and the OCMA-500 itself, which consumes 20% less solvent per measurement than the previous generation of analyzers. Laboratories running regular sample loads generally find the reclaimer pays back quickly.\u003c\/p\u003e\n\n\u003ch3\u003eHandling\u003c\/h3\u003e\n\u003cp\u003eReview the safety data sheet and your local requirements for solvent storage, ventilation and waste disposal before use. Keep bottles sealed and stored away from heat and direct sunlight. Spent solvent should be either reclaimed with an SR-305 or disposed of as regulated solvent waste.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Products\/Process_and_Environmental\/Water_Pollution\/Brochures\/OCMA-500\/OCMA-500_HAE-T0254B.pdf\"\u003eOCMA-500\/550 brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/uploads\/media\/GZ0000331784D=IM=E=OCMA-500.pdf\"\u003eOCMA-500 instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"1.5 kg Bottle - 5200100690","offer_id":48226233417918,"sku":"5200100690","price":595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_OCMA_674df7157d_64a40d48-dadd-4452-b5d3-4764a42ee944.jpg?v=1785353565"},{"product_id":"horiba-ocma-500-ocma-550-spare-parts-amp-consumables","title":"Horiba OCMA-500 \/ OCMA-550 Spare Parts \u0026 Consumables","description":"\u003cp\u003eSpare parts, consumables and calibration oils for the HORIBA OCMA-500 and OCMA-550 oil content analyzers. Select the item you need from the dropdown. All parts are genuine HORIBA.\u003c\/p\u003e\n\n\u003cp\u003eTwo categories matter most for keeping an OCMA in service: the filter element and filter packing in the oil\/water separation section, which are wear items replaced on a routine schedule, and the calibration oils used to set the span of the infrared detector. Neglecting either shows up directly as drift or unreliable results.\u003c\/p\u003e\n\n\u003ch3\u003eFilters and seals\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter element\u003c\/strong\u003e (part no. 5700016168) — 40 mm diameter Teflon filter for the OCMA-500 and OCMA-310. A routine replacement item.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter packing\u003c\/strong\u003e (part no. 3200044264) — O-ring for the oil\/water separation filter section. Replace alongside the filter element to maintain a proper seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSample cell\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuartz crystal sample cell\u003c\/strong\u003e (part no. 3200044428) — for the OCMA-500. Quartz is used because it transmits in the infrared; a scratched, etched or clouded cell degrades the measurement and must be replaced rather than polished.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSample cell cap\u003c\/strong\u003e (part no. 3200044438) — covers the quartz crystal sample cell.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCalibration oils\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eB-heavy oil\u003c\/strong\u003e, 10 mL bottle (part no. 3200043747) — used to prepare span calibration liquid for the OCMA-500. Specific gravity 0.895 at 20 °C. Note that B-heavy oil is viscous and difficult to dispense with a microsyringe; HORIBA recommends weighing it in a screw-top glass container instead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTridecane\u003c\/strong\u003e, 10 mL bottle (part no. 3200762409) — alternative standard for preparing span calibration solution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you know the specific oil type you are measuring, you can also calibrate against that oil rather than a generic standard — this generally gives the most accurate result for your matrix.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eScheduled preventive maintenance on an OCMA-500 or OCMA-550\u003c\/li\u003e\n\u003cli\u003eRestoring measurement accuracy after filter fouling or cell damage\u003c\/li\u003e\n\u003cli\u003eRoutine span calibration and QC verification before compliance sampling\u003c\/li\u003e\n\u003cli\u003eBuilding a spare parts kit so a failed filter or cracked cell does not halt testing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eS-316 extraction solvent, the SR-305 solvent reclaimer and reclaimer consumables are listed separately in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Products\/Process_and_Environmental\/Water_Pollution\/Brochures\/OCMA-500\/OCMA-500_HAE-T0254B.pdf\"\u003eOCMA-500\/550 brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/uploads\/media\/GZ0000331784D=IM=E=OCMA-500.pdf\"\u003eOCMA-500 instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Filter Element - Teflon 40 mm dia. for OCMA-500\/310 - 5700016168","offer_id":48226237022398,"sku":"5700016168","price":27.0,"currency_code":"USD","in_stock":true},{"title":"Filter Packing - O-Ring for Oil\/Water Separation Filter - 3200044264","offer_id":48226237055166,"sku":"3200044264","price":35.0,"currency_code":"USD","in_stock":true},{"title":"B-Heavy Oil - Span Calibration Standard, 10 mL - 3200043747","offer_id":48226237087934,"sku":"3200043747","price":54.0,"currency_code":"USD","in_stock":true},{"title":"Tridecane - Span Calibration Standard, 10 mL - 3200762409","offer_id":48226237120702,"sku":"3200762409","price":75.0,"currency_code":"USD","in_stock":true},{"title":"Quartz Crystal Sample Cell for OCMA-500 - 3200044428","offer_id":48226237153470,"sku":"3200044428","price":790.0,"currency_code":"USD","in_stock":true},{"title":"Sample Cell Cap - 3200044438","offer_id":48226237186238,"sku":"3200044438","price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_OCMA-500_Product_Image_cc759347df.png?v=1785353567"},{"product_id":"horiba-sr-305-solvent-reclaimer-parts-consumables","title":"Horiba SR-305 Solvent Reclaimer Parts \u0026 Consumables","description":"\u003cp\u003eReplacement filters, media and seals for the HORIBA SR-305 solvent reclaimer, which recovers used S-316 extraction solvent for reuse in OCMA oil content analyzers. Select the item you need from the dropdown.\u003c\/p\u003e\n\n\u003cp\u003eThe reclaimer only saves you money while its media is still working. Activated carbon has a finite adsorption capacity, and once it is loaded with oil it stops removing contaminants — reclaimed solvent quality falls off, and that shows up as poor blanks and drifting results on the analyzer. Replacing carbon, alumina and filters on a routine schedule is what keeps recovered solvent usable.\u003c\/p\u003e\n\n\u003ch3\u003eFilters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater separation filters\u003c\/strong\u003e, set of 2, 118 mm diameter (part no. 3200762538) — remove carried-over water from spent solvent before it reaches the media columns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters for carbon container\u003c\/strong\u003e, set of 2 (part no. 3200044429) — special mesh filters that deliberately slow the flow rate so the solvent gets adequate contact time with the activated carbon. Using a substitute filter that flows too freely will reduce reclaim efficiency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMedia\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eActivated carbon\u003c\/strong\u003e, 500 g pack (part no. 3200043781) — adsorbs extracted oil from the spent solvent. The primary consumable in the reclaim process.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActivated alumina\u003c\/strong\u003e, 90 g pack (part no. 3200044431) — final drying and polishing stage after the carbon column.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSeals\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eO-ring set\u003c\/strong\u003e (part no. 3200044035) — holds the water separation and carbon filters in position. Replace when reassembling the column so filters seat correctly and solvent cannot bypass the media.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eScheduled media and filter replacement on an SR-305 reclaimer\u003c\/li\u003e\n\u003cli\u003eRestoring reclaim quality after a drop in recovered solvent performance\u003c\/li\u003e\n\u003cli\u003eCommissioning a reclaimer or returning one to service after storage\u003c\/li\u003e\n\u003cli\u003eHolding a consumable set on the shelf so reclaim cycles are never interrupted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eThe SR-305 reclaimer itself and S-316 extraction solvent are listed separately in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Products\/Process_and_Environmental\/Water_Pollution\/Brochures\/OCMA-500\/OCMA-500_HAE-T0254B.pdf\"\u003eOCMA-500\/550 brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/int\/water-liquid\/products\/series\/oil-content-analyzer\/\"\u003eHORIBA oil content analyzer series\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Water Separation Filters - Set of 2, 118 mm dia. - 3200762538","offer_id":48226243150014,"sku":"3200762538","price":242.0,"currency_code":"USD","in_stock":true},{"title":"Filters for Carbon Container - Set of 2 - 3200044429","offer_id":48226243182782,"sku":"3200044429","price":122.0,"currency_code":"USD","in_stock":true},{"title":"Activated Carbon - 500 g Pack - 3200043781","offer_id":48226243215550,"sku":"3200043781","price":73.0,"currency_code":"USD","in_stock":true},{"title":"Activated Alumina - 90 g Pack - 3200044431","offer_id":48226243248318,"sku":"3200044431","price":168.0,"currency_code":"USD","in_stock":true},{"title":"O-Ring Set - Holds Filters in Place - 3200044035","offer_id":48226243281086,"sku":"3200044035","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_OCMA_674df7157d_d2adb665-5126-4bd4-b9fb-33b7c7f1e73b.jpg?v=1785353579"},{"product_id":"horiba-laqua-wq-300-series-sensor-heads-cartridges-amp-accessories","title":"Horiba LAQUA WQ-300 Series Sensor Heads, Cartridges \u0026 Accessories","description":"\u003cp\u003eSensor heads, replaceable sensor cartridges and accessories for the HORIBA LAQUA WQ-300 Series smart handheld meters (WQ-310, WQ-320 and WQ-330). Select the item you need from the dropdown.\u003c\/p\u003e\n\n\u003cp\u003eThe WQ-300 platform separates the sensor into two parts. The \u003cstrong\u003esensor head\u003c\/strong\u003e carries the cable and connector and plugs into the meter. The \u003cstrong\u003ecartridge\u003c\/strong\u003e screws into the head and contains the actual sensing element. When a pH or ion sensor reaches end of life you replace only the cartridge — the head, cable and connector stay in service. That is the main running-cost advantage of the WQ-300 series over conventional one-piece electrodes.\u003c\/p\u003e\n\n\u003ch3\u003eSensor heads\u003c\/h3\u003e\n\u003cp\u003eAvailable in 2 m and 5 m cable lengths. Choose 5 m where you need to reach into a tank, a well or across a treatment basin without moving the meter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-PH-2 \/ 300-PH-5\u003c\/strong\u003e — pH sensor head. Takes the 300-P-C cartridge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-C-2 \/ 300-C-5\u003c\/strong\u003e — conductivity sensor head. Takes the 300-4C-C or 300-2C-C cartridge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-D-2 \/ 300-D-5\u003c\/strong\u003e — optical dissolved oxygen sensor head. Self-contained; consumable is the 300-D-M sensor tip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-I-2 \/ 300-I-5\u003c\/strong\u003e — ion sensor head. Takes any of the five ISE cartridges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-O-2 \/ 300-O-5\u003c\/strong\u003e — ORP sensor head. Takes the 300-O-C cartridge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCartridges\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-P-C\u003c\/strong\u003e — pH cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-4C-C\u003c\/strong\u003e — conductivity cartridge, 4 cells. The general-purpose choice, covering a wide conductivity span.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-2C-C\u003c\/strong\u003e — conductivity cartridge, 2 cells. For low-conductivity and ultrapure water work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-O-C\u003c\/strong\u003e — ORP cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-NH4-C\u003c\/strong\u003e — ammonium ion cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-NO3-C\u003c\/strong\u003e — nitrate ion cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-K-C\u003c\/strong\u003e — potassium ion cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-CA-C\u003c\/strong\u003e — calcium ion cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-NA-C\u003c\/strong\u003e — sodium ion cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-D-M\u003c\/strong\u003e — replacement sensor tip for the optical dissolved oxygen head\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 BNC\u003c\/strong\u003e — BNC adapter, lets you connect a conventional BNC ion-selective or pH electrode to a WQ-300 meter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e560-PH\u003c\/strong\u003e — pH calibration solution set, pH 4.01, 7.00 and 10.01, 60 mL each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e560-C\u003c\/strong\u003e — conductivity calibration solution set, 84 µS\/cm, 1413 µS\/cm, 12.88 mS\/cm and 111.8 mS\/cm, 60 mL each\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine replacement of worn pH, ORP and ion cartridges\u003c\/li\u003e\n\u003cli\u003eAdding a new parameter to an existing WQ-320 or WQ-330 meter\u003c\/li\u003e\n\u003cli\u003eExtending reach with a 5 m cable for tanks, basins and wells\u003c\/li\u003e\n\u003cli\u003eNutrient and ion monitoring in agriculture, aquaculture and wastewater\u003c\/li\u003e\n\u003cli\u003eLow-conductivity and ultrapure water measurement with the 2-cell cartridge\u003c\/li\u003e\n\u003cli\u003eKeeping spare cartridges on hand so a failed sensor does not stop a sampling run\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Brochures\/Handheld_Meters\/LOW-RES_-_ver._2.0_WQSM-08-2019D_LAQUA_WQ-300_Series_Smart_Meter.pdf\"\u003eLAQUA WQ-300 Series brochure and specifications (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Instruction_Manuals\/Handheld_Meters\/GZ0000574030D_IM_E_WQ-300_series_June_2024.pdf\"\u003eLAQUA WQ-300 Series instruction manual (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eComplete WQ-300 meters and kits: \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"300-PH-2 - pH Sensor Head, 2 m Cable - 3200812206","offer_id":48226282635454,"sku":"3200812206","price":258.0,"currency_code":"USD","in_stock":true},{"title":"300-PH-5 - pH Sensor Head, 5 m Cable - 3200812207","offer_id":48226282668222,"sku":"3200812207","price":290.0,"currency_code":"USD","in_stock":true},{"title":"300-P-C - pH Sensor Cartridge - 3200786363","offer_id":48226282700990,"sku":"3200786363","price":193.0,"currency_code":"USD","in_stock":true},{"title":"300-C-2 - Conductivity Sensor Head, 2 m Cable - 3200784468","offer_id":48226282733758,"sku":"3200784468","price":258.0,"currency_code":"USD","in_stock":true},{"title":"300-C-5 - Conductivity Sensor Head, 5 m Cable - 3200812202","offer_id":48226282766526,"sku":"3200812202","price":290.0,"currency_code":"USD","in_stock":true},{"title":"300-4C-C - Conductivity Cartridge, 4 Cells - 3200780928","offer_id":48226282799294,"sku":"3200780928","price":312.0,"currency_code":"USD","in_stock":true},{"title":"300-2C-C - Conductivity Cartridge, 2 Cells - 3200820579","offer_id":48226282832062,"sku":"3200820579","price":517.0,"currency_code":"USD","in_stock":true},{"title":"300-D-2 - Optical Dissolved Oxygen Sensor Head, 2 m Cable - 3200780940","offer_id":48226282864830,"sku":"3200780940","price":939.0,"currency_code":"USD","in_stock":true},{"title":"300-D-5 - Optical Dissolved Oxygen Sensor Head, 5 m Cable - 3200780942","offer_id":48226282897598,"sku":"3200780942","price":1000.0,"currency_code":"USD","in_stock":true},{"title":"300-D-M - Replacement Sensor Tip for Optical DO Head - 3200781554","offer_id":48226282930366,"sku":"3200781554","price":160.0,"currency_code":"USD","in_stock":true},{"title":"300-I-2 - Ion Sensor Head, 2 m Cable - 3200812203","offer_id":48226282963134,"sku":"3200812203","price":269.0,"currency_code":"USD","in_stock":true},{"title":"300-I-5 - Ion Sensor Head, 5 m Cable - 3200923560","offer_id":48226282995902,"sku":"3200923560","price":290.0,"currency_code":"USD","in_stock":true},{"title":"300-NH4-C - Ammonium Ion Sensor Cartridge - 3200986783","offer_id":48226283028670,"sku":"3200986783","price":616.0,"currency_code":"USD","in_stock":true},{"title":"300-NO3-C - Nitrate Ion Sensor Cartridge - 3200986784","offer_id":48226283061438,"sku":"3200986784","price":616.0,"currency_code":"USD","in_stock":true},{"title":"300-K-C - Potassium Ion Sensor Cartridge - 3200986785","offer_id":48226283094206,"sku":"3200986785","price":616.0,"currency_code":"USD","in_stock":true},{"title":"300-CA-C - Calcium Ion Sensor Cartridge - 3200986786","offer_id":48226283126974,"sku":"3200986786","price":616.0,"currency_code":"USD","in_stock":true},{"title":"300-NA-C - Sodium Ion Sensor Cartridge - 3200986787","offer_id":48226283159742,"sku":"3200986787","price":616.0,"currency_code":"USD","in_stock":true},{"title":"300-O-2 - ORP Sensor Head, 2 m Cable - 3200812204","offer_id":48226283192510,"sku":"3200812204","price":269.0,"currency_code":"USD","in_stock":true},{"title":"300-O-5 - ORP Sensor Head, 5 m Cable - 3200923561","offer_id":48226283225278,"sku":"3200923561","price":290.0,"currency_code":"USD","in_stock":true},{"title":"300-O-C - ORP Sensor Cartridge - 3200922104","offer_id":48226283258046,"sku":"3200922104","price":269.0,"currency_code":"USD","in_stock":true},{"title":"300 BNC - BNC Adapter for ISE Electrodes - 3200821465","offer_id":48226283290814,"sku":"3200821465","price":204.0,"currency_code":"USD","in_stock":true},{"title":"560-PH - pH Calibration Solutions 4.01\/7.00\/10.01, 60 ml - 3200820791","offer_id":48226283323582,"sku":"3200820791","price":34.0,"currency_code":"USD","in_stock":true},{"title":"560-C - Conductivity Calibration Solutions 84uS-111.8mS, 60 ml - 3200820792","offer_id":48226283356350,"sku":"3200820792","price":53.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_300-D-2_01_cc69b1e823.png?v=1785337103"},{"product_id":"horiba-laqua-meter-printers-cables-accessories","title":"Horiba LAQUA Meter Printers, Cables \u0026 Accessories","description":"\u003cp\u003ePrinters, data cables, power supplies and electrode hardware for HORIBA LAQUA handheld and benchtop meters. Select the item you need from the dropdown. These parts span the LAQUA 200, WQ-300, 1500, 2000, F-70 and DS-70 series as well as the older D-70, ES-70 and OM-70 meters — the compatibility for each item is stated in its description below.\u003c\/p\u003e\n\n\u003cp\u003eMost of these items solve one of three problems: getting measurement data off the meter and into a record, keeping the meter powered during long bench sessions, or protecting and organizing electrodes in daily use.\u003c\/p\u003e\n\n\u003ch3\u003ePrinting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrinter\u003c\/strong\u003e — model CBM-910-24RJ-120-A, UL listed, 120 V. Supplied without a cable, so order the correct cable alongside it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrinter paper\u003c\/strong\u003e — 20-roll pack for 50 and 70 series meters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInk ribbon\u003c\/strong\u003e — replacement ribbon for the printer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrinter cable, 1.5 m\u003c\/strong\u003e — for 50 and 70 series meters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrinter cable, current line\u003c\/strong\u003e — D-Sub 25-pin RS-232, 1.5 m, for LAQUA 200, 300, 1500 and 2000 series.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eData transfer\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB cable, current line\u003c\/strong\u003e — phono to USB, connects LAQUA 200, 1500 and 2000 series meters to a computer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB cable, 1 m\u003c\/strong\u003e — connects F series and DS series benchtop meters to a computer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial cable\u003c\/strong\u003e — 9-pin serial, meter to PC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog output cable\u003c\/strong\u003e — for feeding a continuous analog signal to a chart recorder, data logger or PLC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePower\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAC adapter, 7 V \/ 3 A\u003c\/strong\u003e — mains adapter for F-2000 and pH-SE series meters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWQ-300 USB wall charger\u003c\/strong\u003e — USB type B, 10 ft cord.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrode hardware\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode arm\u003c\/strong\u003e — the arm that carries the electrode on FA-70S and FA-70L stands. Order as a replacement or to mount an additional electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode adapter\u003c\/strong\u003e — clamps two electrodes together so they handle as one, for PC-210, PC-220, PD-210 and PD-220 meters which use two electrodes simultaneously.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode hook\u003c\/strong\u003e — for D-70, ES-70 and OM-70 meters, with cable winding function.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor holder, 2 pcs\u003c\/strong\u003e — holds a sensor in position on the bench or stand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode protective cap, standard, 3 pcs\u003c\/strong\u003e — keeps the sensing element wet in storage and shields it from knocks in transit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode protective cap, long, 3 pcs\u003c\/strong\u003e — the longer cap, for 9678 and 9680 electrodes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKCl cap, 3 pcs\u003c\/strong\u003e — cap for the KCl fill port on refillable electrodes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMeter protection\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtective cover\u003c\/strong\u003e — for F-7x and DS-7x benchtop meters, guarding the instrument against spills and splashes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection sheet, 2 pcs\u003c\/strong\u003e — replaceable screen and keypad sheet.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProducing hard-copy measurement records for regulatory or audit purposes\u003c\/li\u003e\n\u003cli\u003eExporting logged data to a PC for reporting and trend analysis\u003c\/li\u003e\n\u003cli\u003eFeeding a live analog signal to a recorder, logger or control system\u003c\/li\u003e\n\u003cli\u003eReplacing consumable printer paper, ribbons and protective caps\u003c\/li\u003e\n\u003cli\u003eRunning benchtop meters on mains power during extended sessions\u003c\/li\u003e\n\u003cli\u003eProtecting glass electrodes in storage and transit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/02_Products\/By_Category\/02_Handheld_Meters\/D-200\/Small_FINAL_-_Brochure_HHM-07-2018A_LAQUA_200_Series_Handheld_Water_Quality_Meters.pdf\"\u003eLAQUA 200 Series brochure (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/static.horiba.com\/fileadmin\/Horiba\/Water_Quality\/04_Support\/Brochures\/Handheld_Meters\/LOW-RES_-_ver._2.0_WQSM-08-2019D_LAQUA_WQ-300_Series_Smart_Meter.pdf\"\u003eLAQUA WQ-300 Series brochure (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eComplete LAQUA meters: \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e. More spares: \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Printer CBM-910-24RJ-120-A, UL 120V (cable not included) - 5700012747","offer_id":48226290139326,"sku":"5700012747","price":530.0,"currency_code":"USD","in_stock":true},{"title":"Printer Cable, 1.5 m, for 50 \u0026 70 Series - 3014030148","offer_id":48226290172094,"sku":"3014030148","price":70.0,"currency_code":"USD","in_stock":true},{"title":"Printer Paper, 20 pcs, for 50 \u0026 70 Series - 3014030149","offer_id":48226290204862,"sku":"3014030149","price":170.0,"currency_code":"USD","in_stock":true},{"title":"Ink Ribbon for Printer - 5700011877","offer_id":48226290237630,"sku":"5700011877","price":38.0,"currency_code":"USD","in_stock":true},{"title":"Printer Cable D-Sub 25-pin RS-232, 1.5 m, for LAQUA 200\/300\/1500\/2000 - 3200779638","offer_id":48226290270398,"sku":"3200779638","price":54.0,"currency_code":"USD","in_stock":true},{"title":"USB Cable Phono to USB, for LAQUA 200\/1500\/2000 - 3201025022","offer_id":48226290303166,"sku":"3201025022","price":54.0,"currency_code":"USD","in_stock":true},{"title":"Serial Cable, 9-pin, Meter to PC - 3014030151","offer_id":48226290335934,"sku":"3014030151","price":59.0,"currency_code":"USD","in_stock":true},{"title":"WQ-300 USB Wall Charger, USB Type B, 10 ft Cord - 5700052445","offer_id":48226290368702,"sku":"5700052445","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Electrode Adapter for PC-210\/220 \u0026 PD-210\/220 - 3200779640","offer_id":48226290401470,"sku":"3200779640","price":16.0,"currency_code":"USD","in_stock":true},{"title":"Electrode Hook for D-70, ES-70 \u0026 OM-70 - 3200528475","offer_id":48226290434238,"sku":"3200528475","price":54.0,"currency_code":"USD","in_stock":true},{"title":"AC Adapter 7V \/ 3A for F-2000 \u0026 pH-SE Series - 3200923846","offer_id":48226346696894,"sku":"3200923846","price":124.0,"currency_code":"USD","in_stock":false},{"title":"USB Cable, F\/DS-x Series to PC, 1 m - 3200373941","offer_id":48226346729662,"sku":"3200373941","price":68.0,"currency_code":"USD","in_stock":false},{"title":"Analog Output Cable - 3014030152","offer_id":48226346762430,"sku":"3014030152","price":23.0,"currency_code":"USD","in_stock":false},{"title":"Sensor Holder (2 pcs) - 3200373961","offer_id":48226346795198,"sku":"3200373961","price":24.0,"currency_code":"USD","in_stock":false},{"title":"Protective Cover for F-7x \u0026 DS-7x Meters - 3200382441","offer_id":48226346827966,"sku":"3200382441","price":28.0,"currency_code":"USD","in_stock":false},{"title":"KCl Cap (3 pcs) - 3200382468","offer_id":48226346860734,"sku":"3200382468","price":19.0,"currency_code":"USD","in_stock":false},{"title":"Electrode Arm for FA-70S \u0026 FA-70L Stands - 3200373991","offer_id":48226346893502,"sku":"3200373991","price":248.0,"currency_code":"USD","in_stock":false},{"title":"Electrode Protective Cap, Standard (3 pcs) - 3200382477","offer_id":48226346926270,"sku":"3200382477","price":28.0,"currency_code":"USD","in_stock":false},{"title":"Electrode Protective Cap, Long, for 9678 \u0026 9680 (3 pcs) - 3200382482","offer_id":48226346959038,"sku":"3200382482","price":28.0,"currency_code":"USD","in_stock":false},{"title":"Protection Sheet (2 pcs) - 3200382462","offer_id":48226346991806,"sku":"3200382462","price":28.0,"currency_code":"USD","in_stock":false}]},{"product_id":"horiba-laqua-tb220-turbidity-meter-accessories-amp-consumables","title":"Horiba LAQUA TB220 Turbidity Meter Accessories \u0026 Consumables","description":"\u003cp\u003eConsumables and accessories for the HORIBA LAQUA TB220 portable turbidity meter. Select the item you need from the dropdown.\u003c\/p\u003e\n\n\u003cp\u003eTurbidity is an optical measurement, which makes it unusually sensitive to the physical condition of the sample vial. Scratches, fingerprints and etching scatter light and push readings upward — an effect most pronounced at low NTU, exactly where drinking water compliance limits sit. Vials are consumables, not permanent hardware, and replacing a worn set is often the single cheapest way to restore confidence in low-range results.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable items\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicone oil and cloth set\u003c\/strong\u003e (3201067504) — the oil fills fine surface imperfections in the vial glass so they stop scattering light. Apply and polish before measuring, especially below 1 NTU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSample vial set, 4 pieces\u003c\/strong\u003e (3201067927) — replacement measurement vials. Keep a spare set so a scratched vial never forces you to accept a questionable reading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVial cover\u003c\/strong\u003e (3201068357) — light shield that seats over the vial in the measurement well, excluding ambient light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarrying case\u003c\/strong\u003e (3201068032) — replacement hard case for transporting the meter, vials and standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine consumable replacement in drinking water compliance programs\u003c\/li\u003e\n\u003cli\u003eRestoring low-NTU measurement accuracy on an instrument giving drifting or inflated readings\u003c\/li\u003e\n\u003cli\u003eEquipping a second field kit without buying a second meter\u003c\/li\u003e\n\u003cli\u003eReplacing items lost or broken in transit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — brochures, manuals and quick guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eComplete TB220 meters and kits: \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Silicone Oil \u0026 Polishing Cloth Set - 3201067504","offer_id":48226329460926,"sku":"3201067504","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Sample Vial Set (4 pieces) - 3201067927","offer_id":48226329493694,"sku":"3201067927","price":103.0,"currency_code":"USD","in_stock":true},{"title":"Vial Cover \/ Light Shield - 3201068357","offer_id":48226329526462,"sku":"3201068357","price":32.0,"currency_code":"USD","in_stock":true},{"title":"Carrying Case - 3201068032","offer_id":48226329559230,"sku":"3201068032","price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_APAC-TB220-image-01_22b98e1aee_d2ea694e-7935-43ef-9156-4a5e1a9cf2f8.jpg?v=1785353582"},{"product_id":"horiba-laqua-electrode-stand","title":"Horiba LAQUA Electrode Stand","description":"\u003cp\u003eElectrode stands for HORIBA LAQUA benchtop water quality meters. A stand holds the electrode securely upright over the sample beaker, leaving both hands free and keeping a fragile glass electrode from being knocked against the benchtop — the single most common cause of electrode breakage in a laboratory.\u003c\/p\u003e\n\n\u003cp\u003eA stand also improves measurement consistency. Immersion depth stays the same between samples, the electrode sits clear of the stirrer bar, and the sensor is parked safely in its storage solution between readings rather than resting on the bench.\u003c\/p\u003e\n\n\u003ch3\u003eChoose your stand\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFA-70L large electrode stand\u003c\/strong\u003e (part no. 3200382560) — the full-size stand, with the reach and stability for larger beakers, multiple electrodes and taller vessels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFA-70S small electrode stand\u003c\/strong\u003e (part no. 3200382557) — a compact stand for routine single-electrode work and crowded benches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStand assembly for LAQUA 1500 and 2000 Series\u003c\/strong\u003e (part no. 3200861022) — the replacement stand assembly supplied with 1500 and 2000 Series meters. Order this if a stand has been damaged or lost, or to fit a stand to an ION-2000, which ships without one.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine benchtop pH, ORP, ion, conductivity and dissolved oxygen measurement\u003c\/li\u003e\n\u003cli\u003eProtecting refillable glass-bodied electrodes from accidental breakage\u003c\/li\u003e\n\u003cli\u003eMaintaining consistent immersion depth for reproducible readings\u003c\/li\u003e\n\u003cli\u003eTitrations and stirred measurements where the electrode must stay clear of the stirrer\u003c\/li\u003e\n\u003cli\u003eReplacing a damaged stand or fitting one to an ION-2000 meter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — brochures, manuals and quick guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eElectrode arms for the FA-70S and FA-70L, sensor holders, protective caps and replacement electrodes are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"FA-70L - Large Electrode Stand - 3200382560","offer_id":48226338996414,"sku":"3200382560","price":680.0,"currency_code":"USD","in_stock":true},{"title":"FA-70S - Small Electrode Stand - 3200382557","offer_id":48226339029182,"sku":"3200382557","price":378.0,"currency_code":"USD","in_stock":true},{"title":"Stand Assembly for LAQUA 1500 \u0026 2000 Series - 3200861022","offer_id":48226339061950,"sku":"3200861022","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_F-71_Product1_71cc113ae9_df88b7de-22c9-4aac-9ad0-4f207c00bb5f.jpg?v=1785353599"},{"product_id":"horiba-3-in-1-combination-ph-electrode-with-built-in-temperature-sensor","title":"Horiba 3-in-1 Combination pH Electrode with Built-in Temperature Sensor","description":"\u003cp\u003eHORIBA 3-in-1 combination pH electrodes contain the pH-sensing glass, the reference half-cell and a temperature sensor in a single body. Because temperature is measured at the same point as pH, the meter applies automatic temperature compensation without a separate probe — one connector, one electrode, correctly compensated readings.\u003c\/p\u003e\n\n\u003cp\u003eThis is the range to choose from when your meter supports automatic temperature compensation. Below, the models are grouped by what makes them different, because picking the wrong body or junction type is the most common cause of poor pH data.\u003c\/p\u003e\n\n\u003ch3\u003eGeneral purpose\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9652-10D\u003c\/strong\u003e (3200786359) — gel-filled combination electrode, black body, 1 m cable. Maintenance-free general workhorse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9652-20D\u003c\/strong\u003e (3200786361) — as above with a 2 m cable for deeper vessels or awkward reach.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9651-10D\u003c\/strong\u003e (3200642020) — gel-filled combination electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9625-10D\u003c\/strong\u003e (3200360505) — plastic-bodied, lead-free. Tougher than glass where breakage is a risk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9615S-10D\u003c\/strong\u003e (3200585428) — ToupH lead-free glass electrode. HORIBA's durable ToupH glass resists abrasion and thermal shock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDifficult samples\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9600-10D\u003c\/strong\u003e (3200358859) — PureIL electrode for ultrapure and very low conductivity water, where ordinary electrodes drift badly or will not stabilize at all.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9631-10D\u003c\/strong\u003e (3200524119) — hydrofluoric acid resistant. HF attacks ordinary pH glass; use this for fluoride-bearing samples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9632-10D\u003c\/strong\u003e (3200524120) — strong alkali resistant, for high-pH samples where standard glass suffers alkali error and shortened life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSleeve junction — for dirty, viscous or low-ionic samples\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6367N-10D\u003c\/strong\u003e (3200991603) — standard sleeve glass electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9681S-10D\u003c\/strong\u003e (3200585463) — ToupH lead-free sleeve electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA sleeve junction can be opened and flushed, so it clears rather than clogs. Choose sleeve types for slurries, emulsions, proteins, soils and tris buffers, where a ceramic junction blocks quickly.\u003c\/p\u003e\n\n\u003ch3\u003eSpecial geometries\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9618N-10D\u003c\/strong\u003e (3200991595) — micro ToupH glass electrode, for very small sample volumes and narrow tubes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9680S-10D\u003c\/strong\u003e (3200585455) — long ToupH lead-free electrode, for deep flasks, tanks and reactors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6252-10D\u003c\/strong\u003e (3014080850) — needle-type glass electrode, for penetrating semi-solids such as meat, cheese, dough, fruit and soil cores.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLaboratory pH measurement and titration\u003c\/li\u003e\n\u003cli\u003eEnvironmental water, wastewater and soil analysis\u003c\/li\u003e\n\u003cli\u003eFood, beverage and dairy quality control\u003c\/li\u003e\n\u003cli\u003ePharmaceutical and cosmetics manufacturing\u003c\/li\u003e\n\u003cli\u003eSemiconductor and power generation ultrapure water monitoring\u003c\/li\u003e\n\u003cli\u003ePlating, etching and chemical process control including HF and caustic streams\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003epH buffer and calibration solutions, electrode filling solutions, storage caps, electrode stands and arms are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"9651-10D - Gel Combination pH Electrode - 3200642020","offer_id":48226367209662,"sku":"3200642020","price":195.0,"currency_code":"USD","in_stock":true},{"title":"9652-10D - Gel Combination pH Electrode, Black, 1 m Cable - 3200786359","offer_id":48226367242430,"sku":"3200786359","price":172.0,"currency_code":"USD","in_stock":true},{"title":"9652-20D - Gel Combination pH Electrode, Black, 2 m Cable - 3200786361","offer_id":48226367275198,"sku":"3200786361","price":193.0,"currency_code":"USD","in_stock":true},{"title":"9625-10D - Plastic Body, Lead Free - 3200360505","offer_id":48226367307966,"sku":"3200360505","price":221.0,"currency_code":"USD","in_stock":true},{"title":"9615S-10D - ToupH Glass, Lead Free - 3200585428","offer_id":48226367340734,"sku":"3200585428","price":295.0,"currency_code":"USD","in_stock":true},{"title":"9600-10D - PureIL, Ultrapure \/ Low Conductivity Water - 3200358859","offer_id":48226367373502,"sku":"3200358859","price":1485.0,"currency_code":"USD","in_stock":true},{"title":"9631-10D - Hydrofluoric Acid Resistant - 3200524119","offer_id":48226367406270,"sku":"3200524119","price":648.0,"currency_code":"USD","in_stock":true},{"title":"9632-10D - Strong Alkali Resistant - 3200524120","offer_id":48226367439038,"sku":"3200524120","price":464.0,"currency_code":"USD","in_stock":true},{"title":"6367N-10D - Standard Sleeve Glass Electrode - 3200991603","offer_id":48226367471806,"sku":"3200991603","price":452.0,"currency_code":"USD","in_stock":true},{"title":"9681S-10D - ToupH Sleeve, Lead Free - 3200585463","offer_id":48226367504574,"sku":"3200585463","price":497.0,"currency_code":"USD","in_stock":true},{"title":"9618N-10D - Micro ToupH Glass Electrode - 3200991595","offer_id":48226367537342,"sku":"3200991595","price":637.0,"currency_code":"USD","in_stock":true},{"title":"9680S-10D - Long ToupH, Lead Free - 3200585455","offer_id":48226367570110,"sku":"3200585455","price":486.0,"currency_code":"USD","in_stock":true},{"title":"6252-10D - Needle Type Glass Electrode - 3014080850","offer_id":48226367602878,"sku":"3014080850","price":378.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_9652-10D_pH_Electrode_-_LAQUA_200_Series_b606fc4d22.png?v=1785337341"},{"product_id":"horiba-combination-ph-electrode-without-temperature-sensor","title":"Horiba Combination pH Electrode without Temperature Sensor","description":"\u003cp\u003eHORIBA combination pH electrodes with the pH glass and reference half-cell in one body, but \u003cstrong\u003eno built-in temperature sensor\u003c\/strong\u003e. They connect to a single pH input and are the right choice when your meter has a separate temperature probe, or when the sample is held at a known constant temperature.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e because there is no temperature element, these electrodes cannot drive automatic temperature compensation on their own. If your samples vary in temperature and you need compensated readings, either pair one of these with a separate temperature electrode such as the 4163-10T, or choose a 3-in-1 electrode instead.\u003c\/p\u003e\n\n\u003ch3\u003eGeneral purpose\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9415-10C\u003c\/strong\u003e (3200611623) — glass-bodied lead-free dome electrode. The dome tip is robust and easy to rinse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9425-10C\u003c\/strong\u003e (3200611625) — plastic-bodied lead-free electrode with 1 m cable. The most economical option here and far less fragile than glass.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eToupH durable glass\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9418-10C\u003c\/strong\u003e (3200611627) — micro ToupH glass electrode for small volumes and narrow vessels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9480-10C\u003c\/strong\u003e (3200611628) — long ToupH lead-free electrode for deep flasks, tanks and reactors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9481-10C\u003c\/strong\u003e (3200611631) — ToupH lead-free sleeve electrode. The sleeve junction can be opened and flushed, so it handles slurries, emulsions, proteins and soil extracts that would clog a ceramic junction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecial geometries\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6069N-10C\u003c\/strong\u003e (3200995147) — micro tube glass electrode, for very small samples and tube-based work such as NMR tubes and microcentrifuge tubes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6261-10C\u003c\/strong\u003e (3014081807) — flat-type glass electrode. The flat sensing surface sits on a sample rather than needing immersion, making it the electrode for surface pH, skin, paper, leather, gels, agar plates and drops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLaboratory pH measurement where temperature is separately monitored or controlled\u003c\/li\u003e\n\u003cli\u003eFood, beverage and dairy quality control\u003c\/li\u003e\n\u003cli\u003eCosmetics, personal care and dermatological surface pH testing\u003c\/li\u003e\n\u003cli\u003ePaper, textile and leather surface pH checks\u003c\/li\u003e\n\u003cli\u003eMicrobiology and culture media testing\u003c\/li\u003e\n\u003cli\u003eSmall-volume and micro-sample work\u003c\/li\u003e\n\u003cli\u003eEnvironmental water and soil extract analysis\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eTemperature electrodes, pH buffer and calibration solutions, filling solutions, storage caps and electrode stands are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"9415-10C - Glass Body Dome, Lead Free - 3200611623","offer_id":48226373075134,"sku":"3200611623","price":232.0,"currency_code":"USD","in_stock":true},{"title":"9425-10C - Plastic Body, Lead Free, 1 m Cable - 3200611625","offer_id":48226373107902,"sku":"3200611625","price":173.0,"currency_code":"USD","in_stock":true},{"title":"9418-10C - Micro ToupH Glass Electrode - 3200611627","offer_id":48226373140670,"sku":"3200611627","price":475.0,"currency_code":"USD","in_stock":true},{"title":"9480-10C - Long ToupH, Lead Free - 3200611628","offer_id":48226373173438,"sku":"3200611628","price":340.0,"currency_code":"USD","in_stock":true},{"title":"9481-10C - ToupH Sleeve, Lead Free - 3200611631","offer_id":48226373206206,"sku":"3200611631","price":427.0,"currency_code":"USD","in_stock":true},{"title":"6069N-10C - Micro Tube Glass Electrode - 3200995147","offer_id":48226373238974,"sku":"3200995147","price":589.0,"currency_code":"USD","in_stock":true},{"title":"6261-10C - Flat Type Glass Electrode - 3014081807","offer_id":48226373271742,"sku":"3014081807","price":329.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Hero_Image_Laqua_Electrodes_fa1421f961_19f1a20b-a528-471c-be6e-06ff0f44d27f.jpg?v=1785337370"},{"product_id":"horiba-ph-half-cell-reference-electrode","title":"Horiba pH Half-Cell \u0026 Reference Electrode","description":"\u003cp\u003eSeparate half-cell and reference electrodes for HORIBA meters set up as two-electrode systems. A combination electrode packages both halves into one body; a two-electrode system keeps them apart, which lets you replace only the part that has failed and lets you choose a reference junction suited to a difficult sample.\u003c\/p\u003e\n\n\u003cp\u003eA pH measurement is a voltage between two half-cells: the glass electrode responds to hydrogen ion activity, and the reference electrode holds a fixed, known potential. Most drifting, unstable or slow pH readings originate in the reference — its junction clogs or its internal solution becomes contaminated — not in the glass. Being able to swap the reference alone is why laboratories running awkward samples still prefer two-electrode setups.\u003c\/p\u003e\n\n\u003ch3\u003epH glass half-cell\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1066A-10C\u003c\/strong\u003e (3014080432) — glass pH electrode. Requires a separate reference electrode; compatible references are the 2060A, 2660A and 2565A.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eReference electrodes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2060A-10T\u003c\/strong\u003e (3014080434) — single ceramic liquid junction. The standard choice for clean aqueous samples, with a low, stable flow rate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2565A-10T\u003c\/strong\u003e (3014080436) — double liquid junction. The second chamber isolates the internal silver\/silver chloride element from the sample, which prevents silver from precipitating in samples containing sulfides, proteins, heavy metals or tris buffers, and stops sample ions from poisoning the reference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to choose a double junction\u003c\/h3\u003e\n\u003cp\u003eUse the 2565A-10T if your samples contain sulfide, chloride-sensitive chemistry, protein, or anything that reacts with silver. A single-junction reference in those samples will clog at the junction, drift, and need frequent replacement. The double junction costs more initially but lasts far longer in that service.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLaboratory pH measurement and potentiometric titration\u003c\/li\u003e\n\u003cli\u003eIon-selective electrode measurements needing a dedicated reference\u003c\/li\u003e\n\u003cli\u003eSamples containing sulfides, proteins or heavy metals\u003c\/li\u003e\n\u003cli\u003eWastewater, plating bath and process chemistry analysis\u003c\/li\u003e\n\u003cli\u003eResearch setups where glass and reference are replaced on separate schedules\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eReference electrode filling solutions, pH buffers, storage caps and electrode stands are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"1066A-10C - Glass pH Electrode (Half-Cell) - 3014080432","offer_id":48226383790270,"sku":"3014080432","price":205.0,"currency_code":"USD","in_stock":true},{"title":"2060A-10T - Reference, Ceramic Liquid Junction - 3014080434","offer_id":48226383823038,"sku":"3014080434","price":178.0,"currency_code":"USD","in_stock":true},{"title":"2565A-10T - Reference, Double Liquid Junction - 3014080436","offer_id":48226383855806,"sku":"3014080436","price":227.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Hero_Image_Laqua_Electrodes_fa1421f961_ed22133b-2d2a-4155-8c9f-0f39bbb388af.jpg?v=1785337369"},{"product_id":"horiba-isfet-non-glass-flat-ph-electrode","title":"Horiba ISFET Non-Glass Flat pH Electrode","description":"\u003cp\u003eThe HORIBA 0040N-10D is an ISFET pH electrode — a solid-state semiconductor sensor with no glass bulb. Its flat sensing surface measures pH on a droplet, a moist surface or a semi-solid sample, and because there is no glass membrane it will not shatter and needs no wet storage.\u003c\/p\u003e\n\n\u003cp\u003eISFET stands for ion-sensitive field-effect transistor. Instead of generating a voltage across a glass membrane, the sensor modulates current through a semiconductor gate in response to hydrogen ion activity at its surface. The practical consequences are what matter: the sensing area is tiny and flat, response is fast, the probe is mechanically robust, and it can be stored dry between uses rather than kept in KCl.\u003c\/p\u003e\n\n\u003ch3\u003eItems\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0040N-10D\u003c\/strong\u003e (3200862858) — complete ISFET flat pH electrode, supplied with the 0141N sensor tip fitted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0141N\u003c\/strong\u003e (3200862632) — replacement ISFET sensor tip.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant compatibility note\u003c\/h3\u003e\n\u003cp\u003eThe 0040N-10D and the 0141N sensor tip are \u003cstrong\u003enot compatible with the older 0040-10D electrode\u003c\/strong\u003e. Check which body you have before ordering a replacement tip — the part numbers differ by a single character and the parts will not interchange.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose ISFET over glass\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMeasures samples too small or too solid for a conventional bulb — a single drop, a cut surface, a paste\u003c\/li\u003e\n\u003cli\u003eNo glass to break in food plants, teaching labs or field kits\u003c\/li\u003e\n\u003cli\u003eCan be stored dry, so it tolerates intermittent use far better than a glass electrode\u003c\/li\u003e\n\u003cli\u003eFlat surface wipes clean easily, reducing carryover between samples\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFood and beverage pH: meat, cheese, dough, fruit, sauces and emulsions\u003c\/li\u003e\n\u003cli\u003eSurface pH measurement on skin, textiles, paper and coatings\u003c\/li\u003e\n\u003cli\u003eCosmetics and personal care formulation testing\u003c\/li\u003e\n\u003cli\u003eMicro-volume samples in research and clinical settings\u003c\/li\u003e\n\u003cli\u003eSoil paste and sediment pH\u003c\/li\u003e\n\u003cli\u003eAny environment where broken glass is unacceptable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003epH buffer and calibration solutions and electrode accessories are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"0040N-10D - ISFET Flat pH Electrode with 0141N Sensor - 3200862858","offer_id":48226386542782,"sku":"3200862858","price":975.0,"currency_code":"USD","in_stock":true},{"title":"0141N - Replacement ISFET Sensor Tip - 3200862632","offer_id":48226386575550,"sku":"3200862632","price":600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Hero_Image_Laqua_Electrodes_fa1421f961_ec6e5638-b875-42b0-a63f-7496707f022b.jpg?v=1785337383"},{"product_id":"horiba-orp-temperature-electrode","title":"Horiba ORP \u0026 Temperature Electrode","description":"\u003cp\u003eReplacement ORP (oxidation-reduction potential) and temperature electrodes for HORIBA meters. ORP is measured in millivolts against a reference and tells you whether a solution is oxidizing or reducing — the single most useful indicator for disinfection control, chemical dosing and treatment endpoint detection.\u003c\/p\u003e\n\n\u003ch3\u003eORP electrodes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9300-10D\u003c\/strong\u003e (3014046710) — waterproof combination ORP electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9301-10D\u003c\/strong\u003e (3200922105) — waterproof combination ORP electrode, black body.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBoth combine the platinum sensing surface and the reference in one waterproof body, so they connect directly to a compatible meter without a separate reference electrode.\u003c\/p\u003e\n\n\u003ch3\u003eTemperature electrode\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4163-10T\u003c\/strong\u003e (3014080375) — temperature electrode, for meters that need a separate temperature input for automatic compensation when the pH or conductivity electrode has no built-in sensor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy ORP is worth measuring\u003c\/h3\u003e\n\u003cp\u003eIn chlorination, ORP reflects the actual disinfecting power of the water rather than the total chlorine present, which is why it is used to control dosing in drinking water, pools and cooling systems. In wastewater it distinguishes aerobic from anoxic and anaerobic conditions, so it is used to verify that nitrification, denitrification and sulfide control are working. In metal finishing it is the standard endpoint indicator for cyanide destruction and chromium reduction.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDrinking water and pool disinfection control\u003c\/li\u003e\n\u003cli\u003eWastewater treatment: aeration, denitrification and sulfide control\u003c\/li\u003e\n\u003cli\u003eCyanide destruction and hexavalent chromium reduction in metal finishing\u003c\/li\u003e\n\u003cli\u003eCooling tower and process water oxidant dosing\u003c\/li\u003e\n\u003cli\u003eRedox titrations and laboratory ORP measurement\u003c\/li\u003e\n\u003cli\u003eGroundwater redox characterization at contaminated sites\u003c\/li\u003e\n\u003cli\u003eAquaculture and hydroponics water quality monitoring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMaintenance note\u003c\/h3\u003e\n\u003cp\u003eA sluggish or non-responsive ORP electrode is usually a fouled platinum surface rather than a failed electrode. Cleaning the platinum restores response in most cases; verify against a known redox standard before replacing the electrode.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eORP standard solutions, electrode storage caps, filling solutions and electrode stands are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"9300-10D - Waterproof Combination ORP Electrode - 3014046710","offer_id":48226391949502,"sku":"3014046710","price":290.0,"currency_code":"USD","in_stock":true},{"title":"9301-10D - Waterproof Combination ORP Electrode, Black - 3200922105","offer_id":48226391982270,"sku":"3200922105","price":260.0,"currency_code":"USD","in_stock":true},{"title":"4163-10T - Temperature Electrode - 3014080375","offer_id":48226392015038,"sku":"3014080375","price":194.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_9301-10D_05d167c931.png?v=1785337342"},{"product_id":"horiba-conductivity-electrode-cell","title":"Horiba Conductivity Electrode \u0026 Cell","description":"\u003cp\u003eReplacement conductivity electrodes and cells for HORIBA meters, covering everything from ultrapure water at the low end to concentrated brines at the high end. Conductivity is also the basis for TDS, salinity and resistivity readings, so the electrode you choose determines the usable range for all of those.\u003c\/p\u003e\n\n\u003ch3\u003eCell constant is the thing to get right\u003c\/h3\u003e\n\u003cp\u003eThe cell constant (K, in cm⁻¹) sets the range where the electrode performs well. Too low a constant in a concentrated sample, or too high a constant in pure water, produces noisy and inaccurate readings even though the meter appears to work.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eK = 0.1 cm⁻¹\u003c\/strong\u003e — low conductivity: pure and ultrapure water, condensate, deionized water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eK = 1 cm⁻¹\u003c\/strong\u003e — general purpose: drinking water, surface water, wastewater, most laboratory samples\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eK = 10 cm⁻¹\u003c\/strong\u003e — high conductivity: seawater, brines, concentrated acids and bases, plating baths\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGeneral purpose electrodes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9382-10D\u003c\/strong\u003e (3014046709) — plastic-bodied conductivity electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9383-10D\u003c\/strong\u003e (3200780927) — plastic-bodied conductivity electrode, black body.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePure and ultrapure water\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9371-10D\u003c\/strong\u003e (3200878882) — stainless steel bodied electrode for ultrapure water. In very low conductivity water, contact with air rapidly absorbs carbon dioxide and corrupts the reading, so this electrode is normally used in a sealed flow arrangement rather than a beaker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Cell\u003c\/strong\u003e (3200844642) — glass flow cell for the 9371-10D and the 300-2C-C cartridge. Keeps the sample isolated from atmosphere for stable low-conductivity measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLaboratory cells\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3551-10D\u003c\/strong\u003e (3014081712) — cell constant 0.1 cm⁻¹\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3552-10D\u003c\/strong\u003e (3014081545) — cell constant 1 cm⁻¹\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3553-10D\u003c\/strong\u003e (3014081714) — cell constant 10 cm⁻¹\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3574-10C\u003c\/strong\u003e (3014082592) — trace flow cell, cell constant 10 cm⁻¹\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDrinking water, surface water and wastewater conductivity and TDS\u003c\/li\u003e\n\u003cli\u003eSemiconductor, pharmaceutical and power plant ultrapure water and condensate monitoring\u003c\/li\u003e\n\u003cli\u003eBoiler and cooling water cycle control\u003c\/li\u003e\n\u003cli\u003eSeawater, estuarine and brine salinity measurement\u003c\/li\u003e\n\u003cli\u003ePlating bath and process chemistry concentration control\u003c\/li\u003e\n\u003cli\u003eLaboratory QC and reagent water verification\u003c\/li\u003e\n\u003cli\u003eSoil and irrigation water salinity assessment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eConductivity calibration standards (84 µS\/cm, 1413 µS\/cm, 12.88 mS\/cm and 111.8 mS\/cm), electrode stands and storage accessories are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"9382-10D - Plastic Body Conductivity Electrode - 3014046709","offer_id":48226397323454,"sku":"3014046709","price":426.0,"currency_code":"USD","in_stock":true},{"title":"9383-10D - Plastic Body Conductivity Electrode, Black - 3200780927","offer_id":48226397356222,"sku":"3200780927","price":426.0,"currency_code":"USD","in_stock":true},{"title":"9371-10D - Stainless Steel Body, Ultrapure Water - 3200878882","offer_id":48226397388990,"sku":"3200878882","price":660.0,"currency_code":"USD","in_stock":true},{"title":"Flow Cell - Glass, for 9371-10D \u0026 300-2C-C - 3200844642","offer_id":48226397421758,"sku":"3200844642","price":230.0,"currency_code":"USD","in_stock":true},{"title":"3551-10D - Cell Constant 0.1 cm-1 - 3014081712","offer_id":48226397454526,"sku":"3014081712","price":810.0,"currency_code":"USD","in_stock":true},{"title":"3552-10D - Cell Constant 1 cm-1 - 3014081545","offer_id":48226397487294,"sku":"3014081545","price":724.0,"currency_code":"USD","in_stock":true},{"title":"3553-10D - Cell Constant 10 cm-1 - 3014081714","offer_id":48226397520062,"sku":"3014081714","price":724.0,"currency_code":"USD","in_stock":true},{"title":"3574-10C - Trace Flow Cell, Cell Constant 10 cm-1 - 3014082592","offer_id":48226397552830,"sku":"3014082592","price":918.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_9371-10D_753500a79c.png?v=1785337343"},{"product_id":"horiba-dissolved-oxygen-electrode","title":"Horiba Dissolved Oxygen Electrode","description":"\u003cp\u003eReplacement dissolved oxygen electrodes for HORIBA meters, in laboratory and field configurations. These are membrane-covered electrochemical DO sensors: oxygen diffuses through a gas-permeable membrane and is reduced at the cathode, producing a current proportional to the oxygen concentration in the sample.\u003c\/p\u003e\n\n\u003ch3\u003eLaboratory\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9521-10D\u003c\/strong\u003e (3200891722) — laboratory DO and BOD electrode with integral stirrer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe built-in stirrer is what makes this the right electrode for BOD bottle work. Membrane DO sensors consume oxygen at the membrane face, so a stagnant sample reads progressively lower as a depleted layer builds up. Standard BOD methods therefore require sample movement at the membrane. An integral stirrer guarantees it, in the confined neck of a BOD bottle where an external stirrer will not fit.\u003c\/p\u003e\n\n\u003ch3\u003eField\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9552-20D\u003c\/strong\u003e (3200780939) — field DO electrode with 2 m cable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9552-50D\u003c\/strong\u003e (3200780941) — field DO electrode with 5 m cable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eChoose the cable length for the depth you need to reach. The 2 m version suits buckets, flow cells and shallow surface water; the 5 m version reaches into tanks, aeration basins, manholes and shallow wells. In still water, move the probe steadily through the sample while reading.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBOD determination in the laboratory to standard methods\u003c\/li\u003e\n\u003cli\u003eWastewater aeration basin and activated sludge process control\u003c\/li\u003e\n\u003cli\u003eSurface water, river and lake dissolved oxygen surveys\u003c\/li\u003e\n\u003cli\u003eAquaculture and fish hatchery oxygen monitoring\u003c\/li\u003e\n\u003cli\u003eGroundwater low-flow purge stabilization\u003c\/li\u003e\n\u003cli\u003eFermentation, brewing and process oxygen checks\u003c\/li\u003e\n\u003cli\u003eStream health and habitat assessment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMaintenance\u003c\/h3\u003e\n\u003cp\u003eMembranes and electrolyte are consumables, not permanent parts. A DO electrode that is slow to respond, will not hold calibration, or reads erratically almost always needs a fresh membrane and electrolyte rather than a new electrode. Replacement membranes and tips for these models are stocked separately.\u003c\/p\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eReplacement DO membranes, electrode tips and stirrer sets are stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"9521-10D - Laboratory DO \/ BOD Electrode with Stirrer - 3200891722","offer_id":48226403451070,"sku":"3200891722","price":680.0,"currency_code":"USD","in_stock":true},{"title":"9552-20D - Field DO Electrode, 2 m Cable - 3200780939","offer_id":48226403483838,"sku":"3200780939","price":517.0,"currency_code":"USD","in_stock":true},{"title":"9552-50D - Field DO Electrode, 5 m Cable - 3200780941","offer_id":48226403516606,"sku":"3200780941","price":660.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_9521_DO_Electrode_376c6f9f6d.png?v=1785337162"},{"product_id":"horiba-do-electrode-replacement-membranes-tips-stirrer","title":"Horiba DO Electrode Replacement Membranes, Tips \u0026 Stirrer","description":"\u003cp\u003eReplacement membranes, electrode tips and stirrer components for HORIBA dissolved oxygen electrodes. These are the wear parts of a membrane DO sensor and are expected to be replaced periodically — they are the difference between a DO electrode that holds calibration and one that appears to have failed.\u003c\/p\u003e\n\n\u003ch3\u003eSelect the item for your electrode\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5402 replacement DO membrane\u003c\/strong\u003e (3200781553) — for the #9552 series field DO electrodes, including 9552-20D and 9552-50D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5401 replacement DO tip\u003c\/strong\u003e (3014072770) — for the #9550 and #9551 DO electrodes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7544 replacement DO membrane\u003c\/strong\u003e (3200891724) — for the 9521-10D laboratory DO and BOD electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7544 DO tip stirring set\u003c\/strong\u003e (3200897227) — replacement stirrer for the electrode tip of the 9521-10D DO electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck your electrode model before ordering — membranes are not interchangeable between the field 9552 series and the laboratory 9521-10D.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to replace\u003c\/h3\u003e\n\u003cp\u003eReplace the membrane if the electrode is slow to reach a stable reading, will not hold calibration between uses, reads erratically, or if the membrane is visibly wrinkled, stretched, fouled, or has trapped bubbles or deposits beneath it. Membrane life depends on how dirty your samples are, so heavy wastewater and sludge users should expect to replace more often than laboratory users. Replacing a membrane is far cheaper than replacing an electrode, and most electrodes assumed to be dead simply need this service.\u003c\/p\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKeep at least one spare membrane on hand before a sampling event — a failed membrane in the field ends the day's DO data\u003c\/li\u003e\n\u003cli\u003eAlways recalibrate after fitting a new membrane and electrolyte\u003c\/li\u003e\n\u003cli\u003eAvoid touching the membrane surface; handle by the cap\u003c\/li\u003e\n\u003cli\u003eCheck for trapped air bubbles when fitting, since a bubble under the membrane will cause a false high reading\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode manuals and maintenance instructions\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eComplete replacement DO electrodes, calibration solutions and other electrode consumables are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"5402 - DO Membrane for #9552 Series - 3200781553","offer_id":48226408595646,"sku":"3200781553","price":190.0,"currency_code":"USD","in_stock":true},{"title":"5401 - DO Tip for #9550 \/ #9551 - 3014072770","offer_id":48226408628414,"sku":"3014072770","price":216.0,"currency_code":"USD","in_stock":true},{"title":"7544 - DO Membrane for 9521-10D - 3200891724","offer_id":48226408661182,"sku":"3200891724","price":270.0,"currency_code":"USD","in_stock":true},{"title":"7544 - DO Tip Stirring Set for 9521-10D - 3200897227","offer_id":48226408693950,"sku":"3200897227","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_7544_Replacement_DO_Electrode_Tip_6af2871ac9.jpg?v=1785337165"},{"product_id":"horiba-ion-selective-electrode-kit","title":"Horiba Ion-Selective Electrode Kit","description":"\u003cp\u003eHORIBA combination ion-selective electrodes measure a specific ion directly in solution, in millivolts converted to concentration against a two-point calibration. Each one ships as a complete working kit rather than a bare electrode, so you can calibrate and measure the day it arrives.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is in every kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCombination ion-selective electrode (sensing element and reference in one body)\u003c\/li\u003e\n\u003cli\u003e100 ppm and 1000 ppm standard solutions, 50 mL each\u003c\/li\u003e\n\u003cli\u003eElectrode filling solution, 50 mL\u003c\/li\u003e\n\u003cli\u003eIonic strength adjustor (ISA), 50 mL\u003c\/li\u003e\n\u003cli\u003eSyringe and droppers\u003c\/li\u003e\n\u003cli\u003eInstruction manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe ammonia, calcium, chloride and potassium kits also include spare sensing parts: 3 membrane caps with the ammonia electrode, and 2 electrode tips each with the calcium, chloride and potassium electrodes.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable ions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5002S-10C\u003c\/strong\u003e (3200698386) — ammonia (NH\u003csub\u003e3\u003c\/sub\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6583S-10C\u003c\/strong\u003e (3200697410) — calcium (Ca\u003csup\u003e2+\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6560S-10C\u003c\/strong\u003e (3200697407) — chloride (Cl\u003csup\u003e-\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6561S-10C\u003c\/strong\u003e (3200693774) — fluoride (F\u003csup\u003e-\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6581S-10C\u003c\/strong\u003e (3200697408) — nitrate (NO\u003csub\u003e3\u003c\/sub\u003e\u003csup\u003e-\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6582S-10C\u003c\/strong\u003e (3200697409) — potassium (K\u003csup\u003e+\u003c\/sup\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy the ionic strength adjustor matters\u003c\/h3\u003e\n\u003cp\u003eAn ion-selective electrode responds to ion \u003cem\u003eactivity\u003c\/em\u003e, not concentration, and activity depends on the total ionic strength of the solution. Adding the same volume of ISA to both your standards and your samples forces them to a common, high ionic strength, so activity tracks concentration and the calibration transfers correctly to the sample. Skipping the ISA is the most common reason ISE results come back wrong. For fluoride the ISA also complexes interfering aluminum and iron and buffers the pH.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAmmonia in wastewater influent and effluent, and nitrification monitoring\u003c\/li\u003e\n\u003cli\u003eNitrate in drinking water, groundwater, surface water and soil extracts\u003c\/li\u003e\n\u003cli\u003eFluoride in drinking water fluoridation control and industrial effluent\u003c\/li\u003e\n\u003cli\u003eChloride in water, brines, food products and concrete or aggregate extracts\u003c\/li\u003e\n\u003cli\u003eCalcium in water hardness, agriculture and food and beverage analysis\u003c\/li\u003e\n\u003cli\u003ePotassium in soil and plant tissue extracts, fertilizers and nutrient solutions\u003c\/li\u003e\n\u003cli\u003eTeaching laboratories demonstrating potentiometric ion measurement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eConsumables\u003c\/h3\u003e\n\u003cp\u003eReplacement ion cartridges, ammonia membrane caps, standard solutions and ionic strength adjustors are stocked separately — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Treat the sensing cartridge or membrane as a consumable and budget for periodic replacement.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Ammonia - 5002S-10C - 3200698386","offer_id":48226414526654,"sku":"3200698386","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"Calcium - 6583S-10C - 3200697410","offer_id":48226414559422,"sku":"3200697410","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"Chloride - 6560S-10C - 3200697407","offer_id":48226414592190,"sku":"3200697407","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"Fluoride - 6561S-10C - 3200693774","offer_id":48226414624958,"sku":"3200693774","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"Nitrate - 6581S-10C - 3200697408","offer_id":48226414657726,"sku":"3200697408","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"Potassium - 6582S-10C - 3200697409","offer_id":48226414690494,"sku":"3200697409","price":1037.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Ion_Sensor_Cartridge_396ba3b411_e1ba743e-97b0-4df1-b8fb-f2d25d7057f7.png?v=1785337384"},{"product_id":"horiba-ion-electrode-replacement-cartridges-membranes","title":"Horiba Ion Electrode Replacement Cartridges \u0026 Membranes","description":"\u003cp\u003eReplacement sensing cartridges and membrane caps for HORIBA combination ion-selective electrodes. The cartridge carries the ion-sensing element, and it is the consumable part of the electrode — when response goes slow, the slope falls off, or readings will no longer calibrate, replacing the cartridge restores the electrode instead of requiring a whole new one.\u003c\/p\u003e\n\n\u003cp\u003eAt a fraction of the price of a complete electrode kit, keeping the right cartridge on the shelf is what keeps an ISE method running. Cartridges are electrode-specific; match the part below to the electrode you own.\u003c\/p\u003e\n\n\u003ch3\u003eCartridges and membranes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmmonia membrane cap, set of 3\u003c\/strong\u003e (3200705774) — for the 5002S-10C ammonia electrode. Gas-permeable membrane caps, supplied three to a set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7683S calcium ion cartridge\u003c\/strong\u003e (3200697414) — for the 6583S-10C calcium electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7660S chloride ion cartridge\u003c\/strong\u003e (3200697411) — for the 6560S-10C chloride electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7661S fluoride ion cartridge\u003c\/strong\u003e (3200693606) — for the 6561S-10C fluoride electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7681S nitrate ion cartridge\u003c\/strong\u003e (3200697412) — for the 6581S-10C nitrate electrode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7682S potassium ion cartridge\u003c\/strong\u003e (3200697413) — for the 6582S-10C potassium electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to replace a cartridge\u003c\/h3\u003e\n\u003cp\u003eThe clearest indicator is calibration slope. An ion-selective electrode should produce close to the theoretical millivolt change per decade of concentration; when the measured slope drifts well outside that, the sensing element is exhausted. Other signs are a response time that lengthens from seconds to minutes, readings that will not settle, and standards that no longer reproduce. Verify with fresh standards and correct ionic strength adjustor addition before replacing — degraded standards mimic a failing cartridge.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRestoring ISE performance in routine wastewater and drinking water laboratories\u003c\/li\u003e\n\u003cli\u003eMaintaining ammonia and nitrate methods for nitrification monitoring\u003c\/li\u003e\n\u003cli\u003eFluoride monitoring for drinking water fluoridation compliance\u003c\/li\u003e\n\u003cli\u003eChloride determination in water, brines and construction materials\u003c\/li\u003e\n\u003cli\u003eSoil, plant tissue and fertilizer analysis for calcium and potassium\u003c\/li\u003e\n\u003cli\u003eTeaching laboratories where electrodes see heavy seasonal use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.horiba.com\/ind\/water-quality\/download\/\"\u003eHORIBA water quality document library — electrode brochures and manuals\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eComplete ion-selective electrode kits, standard solutions, filling solutions and ionic strength adjustors are in the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"Ammonia Membrane Cap, Set of 3 - for 5002S-10C - 3200705774","offer_id":48226418983102,"sku":"3200705774","price":313.0,"currency_code":"USD","in_stock":true},{"title":"7683S Calcium Ion Cartridge - for 6583S-10C - 3200697414","offer_id":48226419015870,"sku":"3200697414","price":421.0,"currency_code":"USD","in_stock":true},{"title":"7660S Chloride Ion Cartridge - for 6560S-10C - 3200697411","offer_id":48226419048638,"sku":"3200697411","price":421.0,"currency_code":"USD","in_stock":true},{"title":"7661S Fluoride Ion Cartridge - for 6561S-10C - 3200693606","offer_id":48226419081406,"sku":"3200693606","price":710.0,"currency_code":"USD","in_stock":true},{"title":"7681S Nitrate Ion Cartridge - for 6581S-10C - 3200697412","offer_id":48226419114174,"sku":"3200697412","price":421.0,"currency_code":"USD","in_stock":true},{"title":"7682S Potassium Ion Cartridge - for 6582S-10C - 3200697413","offer_id":48226419146942,"sku":"3200697413","price":421.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_Ion_Sensor_Cartridge_396ba3b411_6714bd8e-83a4-4b80-8042-eaa480e22c98.png?v=1785337168"},{"product_id":"horiba-ph-buffer-standard-solutions","title":"Horiba pH Buffer \u0026 Standard Solutions","description":"\u003cp\u003eGenuine HORIBA pH buffer and standard solutions for calibrating any HORIBA pH meter or electrode — LAQUAtwin pocket meters, LAQUA 200 and WQ-300 handhelds, LAQUA 1500\/2000 and F-70 benchtops, and the U-50 series field sondes.\u003c\/p\u003e\n\n\u003cp\u003eA pH measurement is only as good as the buffer it was calibrated against. Buffers absorb carbon dioxide from the air and drift over time once opened, and alkaline buffers drift fastest — a pH 10 bottle left open on the bench will read low within weeks. Using fresh, in-date buffer is the single most effective way to keep pH data defensible.\u003c\/p\u003e\n\n\u003ch3\u003eTwo buffer conventions — choose the right one\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSA \/ technical series\u003c\/strong\u003e — pH 4.01, 7.00 and 10.01. The convention used across most US laboratories and regulatory programs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIST \/ DIN series\u003c\/strong\u003e — pH 4.01, 6.86 and 9.18. Used where NIST-traceable buffer values are specified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not mix conventions within one calibration. If your SOP or permit names buffer values, match them exactly.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is available\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReady-to-use 500 mL bottles\u003c\/strong\u003e — pH 2, 4, 7, 9 and 10. The standard choice for routine bench and field calibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolution sets\u003c\/strong\u003e — three buffers plus KCl reference filling solution in one box, in USA or NIST values. The economical way to equip a new meter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcentrated solution\u003c\/strong\u003e — pH 4 concentrate, diluted before use to reduce shipping and storage volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffer powders\u003c\/strong\u003e — pH 4, 7 and 9 sachets made up with deionized water as needed. Powders do not drift in storage, so they are ideal for infrequent use, remote sites and long shelf-life stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHandling for reliable results\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePour buffer into a clean beaker and discard it after use — never return used buffer to the bottle\u003c\/li\u003e\n\u003cli\u003eKeep bottles tightly capped and out of direct sunlight\u003c\/li\u003e\n\u003cli\u003eRinse the electrode with deionized water between buffers, and blot rather than wipe\u003c\/li\u003e\n\u003cli\u003eCalibrate at the temperature of your samples wherever possible\u003c\/li\u003e\n\u003cli\u003eReplace alkaline buffers more frequently than acidic ones\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eConductivity standards, ORP standards, ion standards, ionic strength adjustors, electrode filling solutions and electrode cleaning reagents are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. The 4 L pH 4 standard solution is listed with the U-50 Series accessories, and the 60 mL pH calibration set that fits the LAQUA 200 and WQ-300 carrying cases is listed with the WQ-300 sensor accessories.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"101-SU Set - pH 4.01, 7.00, 10.01 + KCl - USA Values - 3200738717","offer_id":48226438381758,"sku":"3200738717","price":76.0,"currency_code":"USD","in_stock":true},{"title":"101-S Set - pH 4.01, 6.86, 9.18 + KCl - NIST Values - 3200043642","offer_id":48226438414526,"sku":"3200043642","price":76.0,"currency_code":"USD","in_stock":true},{"title":"100-2 - pH 2 Standard Solution, 500 mL - 3200043639","offer_id":48226438447294,"sku":"3200043639","price":54.0,"currency_code":"USD","in_stock":true},{"title":"100-4 - pH 4 Standard Solution, 500 mL - 3200043638","offer_id":48226438480062,"sku":"3200043638","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-7 - pH 7 Standard Solution, 500 mL - 3200043637","offer_id":48226438512830,"sku":"3200043637","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-9 - pH 9 Standard Solution, 500 mL - 3200043636","offer_id":48226438545598,"sku":"3200043636","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-10 - pH 10 Standard Solution, 500 mL - 3200043635","offer_id":48226438578366,"sku":"3200043635","price":38.0,"currency_code":"USD","in_stock":true},{"title":"110-4 - pH 4 Standard Solution, Concentrated, 500 mL - 3200043626","offer_id":48226438611134,"sku":"3200043626","price":49.0,"currency_code":"USD","in_stock":true},{"title":"150-4 - pH 4 Standard Buffer Powder - 3200043619","offer_id":48226438643902,"sku":"3200043619","price":54.0,"currency_code":"USD","in_stock":true},{"title":"150-7 - pH 7 Standard Buffer Powder - 3200043620","offer_id":48226438676670,"sku":"3200043620","price":54.0,"currency_code":"USD","in_stock":true},{"title":"150-9 - pH 9 Standard Buffer Powder - 3200043621","offer_id":48226438709438,"sku":"3200043621","price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_pH_Standard_Solution_560-P_Product_3e2a8150af.png?v=1785337191"},{"product_id":"horiba-conductivity-standard-solutions","title":"Horiba Conductivity Standard Solutions","description":"\u003cp\u003eGenuine HORIBA conductivity standard solutions for calibrating HORIBA conductivity, TDS and salinity meters and cells — LAQUAtwin EC pocket meters, LAQUA 200 and WQ-300 handhelds, LAQUA 1500\/2000 and F-70 benchtops, and the U-50 series field sondes.\u003c\/p\u003e\n\n\u003cp\u003eConductivity cells drift as the electrode surface fouls or platinizes, and the cell constant shifts with it. Calibrating against a certified standard restores the true cell constant. The critical point is to calibrate near the conductivity you actually measure — a cell calibrated at 84 µS\/cm will not give reliable readings in seawater, and one calibrated at 111.8 mS\/cm will be poor in drinking water.\u003c\/p\u003e\n\n\u003ch3\u003eChoosing the right standard\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e84 µS\/cm\u003c\/strong\u003e — deionized, distilled and low-conductivity water; boiler feedwater and condensate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1,413 µS\/cm (1.41 mS\/cm)\u003c\/strong\u003e — the general-purpose standard. Drinking water, groundwater, surface water and most environmental samples\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12.88 mS\/cm\u003c\/strong\u003e — brackish water, wastewater, nutrient and hydroponic solutions, higher-TDS process water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e111.8 mS\/cm\u003c\/strong\u003e — seawater, brines, salinity work and high-conductivity industrial streams\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhere a wide range is measured, calibrate at multiple points. The four-bottle 103-S set covers all four values and is the usual choice for a multi-point calibration or for equipping a new instrument.\u003c\/p\u003e\n\n\u003ch3\u003eHandling for reliable results\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePour into a clean beaker and discard after use — never return used standard to the bottle\u003c\/li\u003e\n\u003cli\u003eConductivity is strongly temperature dependent; allow the standard to reach the same temperature as your samples before calibrating\u003c\/li\u003e\n\u003cli\u003eKeep bottles tightly capped; evaporation concentrates the solution and raises its true value\u003c\/li\u003e\n\u003cli\u003eRinse the cell thoroughly with deionized water between standards, and again before measuring\u003c\/li\u003e\n\u003cli\u003eWork from low conductivity to high to minimize carry-over\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eConductivity electrodes and cells in K=0.1, K=1 and K=10 cell constants, pH buffers, ORP standards and electrode cleaning reagents are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. The 60 mL conductivity calibration set that fits the LAQUA 200 and WQ-300 carrying cases is listed with the WQ-300 sensor accessories.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"103-S Set - 84 uS\/cm, 1.41, 12.88 \u0026 111.8 mS\/cm - 250 mL Each - 3200738718","offer_id":48226443100350,"sku":"3200738718","price":76.0,"currency_code":"USD","in_stock":true},{"title":"100-21 - 84 uS\/cm, 500 mL - 3200738713","offer_id":48226443133118,"sku":"3200738713","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-22 - 1.41 mS\/cm (1413 uS\/cm), 500 mL - 3200738714","offer_id":48226443165886,"sku":"3200738714","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-23 - 12.88 mS\/cm, 500 mL - 3200738715","offer_id":48226443198654,"sku":"3200738715","price":32.0,"currency_code":"USD","in_stock":true},{"title":"100-24 - 111.8 mS\/cm, 500 mL - 3200738716","offer_id":48226443231422,"sku":"3200738716","price":32.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_COND_stand_560-C_Product_3be156f98f.png?v=1785337191"},{"product_id":"horiba-orp-standard-powder","title":"Horiba ORP Standard Powder","description":"\u003cp\u003eHORIBA ORP standard powders for verifying the response of an ORP (redox potential) electrode. Each sachet is made up with a known pH buffer immediately before use to produce a solution of defined millivolt value, giving you a reference point to confirm the electrode is reading correctly.\u003c\/p\u003e\n\n\u003cp\u003eORP electrodes are not calibrated in the way pH electrodes are — most meters display raw millivolts with no user calibration step. Instead you verify: measure a known standard, and if the reading falls outside the expected window the platinum or gold surface needs cleaning, or the reference junction is fouled or depleted. Without a standard there is no way to distinguish a genuinely unusual sample from a failing electrode.\u003c\/p\u003e\n\n\u003ch3\u003eTwo values\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e160-51\u003c\/strong\u003e (part no. 3200043618) — nominal 89 mV standard powder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e160-22\u003c\/strong\u003e (part no. 3200043617) — nominal 258 mV standard powder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsing both gives you two points across the range and will reveal a sluggish or drifting electrode that a single check might miss.\u003c\/p\u003e\n\n\u003ch3\u003eWhy powder rather than a ready-made solution\u003c\/h3\u003e\n\u003cp\u003eRedox standards are inherently unstable in solution — they exchange with atmospheric oxygen and their potential shifts. Supplying the reagent as a dry powder means the standard is made fresh at the moment of use, so the millivolt value you compare against is trustworthy. Powders also store indefinitely, which suits laboratories that verify ORP only occasionally.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine verification of ORP electrodes on LAQUA handheld and benchtop meters\u003c\/li\u003e\n\u003cli\u003eConfirming U-50 series sonde ORP response before a sampling event\u003c\/li\u003e\n\u003cli\u003eDiagnosing suspect redox readings in groundwater and landfill leachate monitoring\u003c\/li\u003e\n\u003cli\u003eDisinfection and chlorination control checks in drinking water and pool systems\u003c\/li\u003e\n\u003cli\u003eWastewater treatment redox monitoring, including nitrification and denitrification stages\u003c\/li\u003e\n\u003cli\u003eDocumented instrument verification under a laboratory quality system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eORP electrodes, replacement U-50 ORP sensors, electrode cleaning reagents and reference electrode filling solutions are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. A ready-made 255 mV ORP standard in 14 mL sachets for LAQUAtwin pocket meters is listed with the LAQUAtwin solutions.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"160-51 - ORP Standard Powder, 89 mV - 3200043618","offer_id":48226450211006,"sku":"3200043618","price":76.0,"currency_code":"USD","in_stock":true},{"title":"160-22 - ORP Standard Powder, 258 mV - 3200043617","offer_id":48226450243774,"sku":"3200043617","price":76.0,"currency_code":"USD","in_stock":true}]},{"product_id":"horiba-tb220-turbidity-calibration-standard-solutions","title":"Horiba TB220 Turbidity Calibration Standard Solutions","description":"\u003cp\u003eSealed calibration standards for the HORIBA LAQUA TB220 portable turbidity meter. Each standard is supplied in a 50 mL vial at a certified NTU value, ready to place straight into the instrument — no dilution, no formazin preparation, no handling of hazardous stock suspensions.\u003c\/p\u003e\n\n\u003ch3\u003eChoose your set\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e550-TBP-4\u003c\/strong\u003e (part no. 3201063378) — full four-point set: 0.02, 20, 100 and 800 NTU. Calibrates the meter across its entire measuring range and is the right choice for a new instrument or an annual full recalibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e550-TBP-2L\u003c\/strong\u003e (part no. 3201063380) — low set: 0.02 and 20 NTU. For work concentrated at the clean end, such as finished drinking water and filter effluent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e550-TBP-2H\u003c\/strong\u003e (part no. 3201063381) — high set: 100 and 800 NTU. For turbid work such as raw water, stormwater and sediment monitoring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy the 0.02 NTU standard matters\u003c\/h3\u003e\n\u003cp\u003eThe low-end standard is what makes trustworthy drinking water measurement possible. Regulatory turbidity limits for filtered water sit well below 1 NTU, so an instrument calibrated only at higher values is being asked to extrapolate into precisely the range where the decision gets made. Calibrating at 0.02 NTU anchors the meter where your compliance readings actually fall.\u003c\/p\u003e\n\n\u003ch3\u003eHandling for accurate results\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInvert sealed standards gently before use — never shake, which introduces bubbles that scatter light and inflate readings\u003c\/li\u003e\n\u003cli\u003eLet the vial come to ambient temperature to prevent condensation on the glass\u003c\/li\u003e\n\u003cli\u003eWipe the vial clean and apply silicone oil to mask fine scratches before measuring\u003c\/li\u003e\n\u003cli\u003eAlways insert the vial in the same orientation, using the index mark\u003c\/li\u003e\n\u003cli\u003eStore out of direct sunlight and replace standards at the end of their stated shelf life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDrinking water treatment and distribution compliance calibration\u003c\/li\u003e\n\u003cli\u003eFilter performance verification and breakthrough monitoring\u003c\/li\u003e\n\u003cli\u003eStormwater and construction site discharge monitoring programs\u003c\/li\u003e\n\u003cli\u003eSurface water and watershed survey work\u003c\/li\u003e\n\u003cli\u003eWastewater effluent clarity verification\u003c\/li\u003e\n\u003cli\u003eDocumented instrument calibration under a laboratory quality system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eThe TB220 meter, spare sample vials, vial light shield covers, silicone oil and cloth sets and replacement carrying cases are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"550-TBP-4 - Four-Point Set 0.02, 20, 100 \u0026 800 NTU - 50 mL Each - 3201063378","offer_id":48226454208702,"sku":"3201063378","price":400.0,"currency_code":"USD","in_stock":true},{"title":"550-TBP-2L - Low Range Set 0.02 \u0026 20 NTU - 50 mL Each - 3201063380","offer_id":48226454241470,"sku":"3201063380","price":230.0,"currency_code":"USD","in_stock":true},{"title":"550-TBP-2H - High Range Set 100 \u0026 800 NTU - 50 mL Each - 3201063381","offer_id":48226454274238,"sku":"3201063381","price":255.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_APAC-TB220-image-01_22b98e1aee_6a283c9e-a2c1-474b-ac18-8b24f8a02013.jpg?v=1785353581"},{"product_id":"horiba-reference-electrode-internal-filling-solution","title":"Horiba Reference Electrode Internal Filling Solution","description":"\u003cp\u003eInternal filling solutions for refillable HORIBA reference and combination pH electrodes. These are the electrolyte that fills the reference chamber and completes the electrical circuit through the liquid junction — without it at the correct level and concentration, the electrode cannot produce a stable reading regardless of how well the glass membrane is working.\u003c\/p\u003e\n\n\u003cp\u003eRefillable electrodes are topped up as part of routine maintenance. The level falls through normal outflow at the junction, and the solution should also be replaced periodically because it gradually becomes contaminated by sample carried back through the junction. A slow, drifting or noisy pH reading on a refillable electrode is very often nothing more than low or stale filling solution.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is available\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e310\u003c\/strong\u003e (part no. 3200043622) — internal filling solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300\u003c\/strong\u003e (part no. 3200043640) — reference electrode internal solution for pH electrodes, 250 mL.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKeep the filling solution level above the sample level so flow is always outward through the junction — this prevents sample being drawn into the reference chamber\u003c\/li\u003e\n\u003cli\u003eOpen the filling port during measurement and close it for storage\u003c\/li\u003e\n\u003cli\u003eReplace, rather than just top up, the solution if readings remain unstable after cleaning\u003c\/li\u003e\n\u003cli\u003eNever substitute deionized water for filling solution — it destroys the reference potential\u003c\/li\u003e\n\u003cli\u003eMatch the solution to the electrode type; using the wrong concentration shifts the reading\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoutine maintenance of refillable glass-body pH and reference electrodes\u003c\/li\u003e\n\u003cli\u003eRestoring stability to an electrode with slow or drifting response\u003c\/li\u003e\n\u003cli\u003eRecommissioning an electrode that has been in storage\u003c\/li\u003e\n\u003cli\u003eLaboratory and field pH programs running refillable rather than gel-filled electrodes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eReference electrodes, refillable combination pH electrodes, electrode cleaning reagents, pH buffers and KCl caps are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. The 330 gel-type 3.33 mol\/L KCl reference solution is listed with the U-50 Series accessories, and ion-selective electrode filling solutions are listed separately.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"310 - Internal Filling Solution - 3200043622","offer_id":48226459582654,"sku":"3200043622","price":33.0,"currency_code":"USD","in_stock":true},{"title":"300 - Reference Electrode Internal Solution for pH, 250 mL - 3200043640","offer_id":48226459615422,"sku":"3200043640","price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_525-3-KCl_Low-Res_ae9546b931.png?v=1785337371"},{"product_id":"horiba-ph-electrode-cleaning-solutions","title":"Horiba pH Electrode Cleaning Solutions","description":"\u003cp\u003eHORIBA cleaning reagents for restoring fouled pH electrodes. A pH electrode that has become slow to settle, drifts, or will no longer calibrate within specification is usually not worn out — its glass membrane and liquid junction are coated. The correct cleaning reagent will often bring it back rather than requiring a new electrode.\u003c\/p\u003e\n\n\u003cp\u003eThe key is matching the reagent to the fouling. Different deposits need different chemistry, and using the wrong one wastes time and can leave the coating in place. Choose based on what your samples contain.\u003c\/p\u003e\n\n\u003ch3\u003eWhich cleaner do I need\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e220\u003c\/strong\u003e (part no. 3014028653) — breaks down \u003cstrong\u003eorganic\u003c\/strong\u003e deposits. Use for oils, greases, fats, hydrocarbons, algae and general organic film. The right choice for wastewater, food processing, groundwater with hydrocarbon impact, and environmental samples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250\u003c\/strong\u003e (part no. 3200366771) — breaks down \u003cstrong\u003eprotein\u003c\/strong\u003e deposits. Use for blood, dairy, brewing and fermentation, biological media and any sample with significant protein load. Protein coagulates onto glass and will not shift with an organic cleaner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e230\u003c\/strong\u003e (part no. 3200530494) — dedicated cleaning solution for the 9630-10D pure water pH electrode.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSymptoms that point to cleaning rather than replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReadings take much longer to stabilize than they used to\u003c\/li\u003e\n\u003cli\u003eCalibration slope has fallen but the electrode is not old\u003c\/li\u003e\n\u003cli\u003eReadings drift steadily in one direction\u003c\/li\u003e\n\u003cli\u003eVisible film, discoloration or deposit on the glass bulb or junction\u003c\/li\u003e\n\u003cli\u003eResults differ between the electrode and a known-good one on the same sample\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways recalibrate after cleaning. If performance does not recover after cleaning and fresh filling solution, the electrode has genuinely reached end of life.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eScheduled preventive maintenance on laboratory and field pH electrodes\u003c\/li\u003e\n\u003cli\u003eRecovering electrodes used in wastewater, effluent and industrial process samples\u003c\/li\u003e\n\u003cli\u003eFood, beverage, dairy and brewing quality control electrodes\u003c\/li\u003e\n\u003cli\u003eRestoring electrodes before a calibration or accreditation audit\u003c\/li\u003e\n\u003cli\u003eExtending electrode service life to reduce replacement spend\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eReplacement pH electrodes, reference electrodes, internal filling solutions and pH buffers are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. The #251 cleaning solution used with the LAQUAtwin Ca-11C blood calcium meter is listed with the LAQUAtwin solutions.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"220 - Cleaning Solution for Organic Deposits - 3014028653","offer_id":48226463776958,"sku":"3014028653","price":49.0,"currency_code":"USD","in_stock":true},{"title":"250 - Cleaning Solution for Protein Deposits - 3200366771","offer_id":48226463809726,"sku":"3200366771","price":49.0,"currency_code":"USD","in_stock":true},{"title":"230 - Cleaning Solution for 9630-10D Pure Water Electrode - 3200530494","offer_id":48226463842494,"sku":"3200530494","price":81.0,"currency_code":"USD","in_stock":true}]},{"product_id":"horiba-ion-standard-solutions","title":"Horiba Ion Standard Solutions","description":"\u003cp\u003eGenuine HORIBA ion standard solutions for calibrating ion-selective electrodes on LAQUA handheld and benchtop meters. Each 500 mL bottle is supplied at a certified concentration so you can build a two-point calibration across the range you actually measure.\u003c\/p\u003e\n\n\u003cp\u003eEvery ion is available in two strengths — \u003cstrong\u003e1000 mg\/L\u003c\/strong\u003e (suffix SH, high) and \u003cstrong\u003e100 mg\/L\u003c\/strong\u003e (suffix SL, low). Ion-selective electrodes respond logarithmically to concentration, so calibrating at two points a decade apart is what establishes the slope of that response. A single-point calibration only sets an offset and will give increasingly wrong answers the further your sample sits from that one point.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable ions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmmonium\u003c\/strong\u003e (NH₄⁺) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium\u003c\/strong\u003e (Ca²⁺) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChloride\u003c\/strong\u003e (Cl⁻) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluoride\u003c\/strong\u003e (F⁻) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrate\u003c\/strong\u003e (NO₃⁻) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotassium\u003c\/strong\u003e (K⁺) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSodium\u003c\/strong\u003e (Na⁺) — 1000 and 100 mg\/L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBracket your samples\u003c\/h3\u003e\n\u003cp\u003eChoose the pair of standards that spans your expected sample concentrations. If your samples typically fall between 5 and 50 mg\/L, calibrate with the 100 mg\/L standard and a dilution of it rather than with the 1000 mg\/L standard — extrapolating well below the calibrated range is where ISE measurements most often go wrong. Prepare dilutions with deionized water and use them the same day.\u003c\/p\u003e\n\n\u003ch3\u003eUse an ionic strength adjustor\u003c\/h3\u003e\n\u003cp\u003eAn ISE responds to ion \u003cem\u003eactivity\u003c\/em\u003e, not total concentration, and activity depends on the ionic strength of the solution. Adding the matching ionic strength adjustor (ISA, or TISAB for fluoride) to both your standards and your samples in equal proportion brings them to a common ionic strength so the comparison is valid. Skipping this step is the most common cause of ISE results that look plausible but read consistently low. Adjustors are listed separately.\u003c\/p\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNutrient monitoring — nitrate and ammonium in surface water, groundwater and effluent\u003c\/li\u003e\n\u003cli\u003eDrinking water fluoride compliance monitoring\u003c\/li\u003e\n\u003cli\u003eChloride determination in water, brines and process streams\u003c\/li\u003e\n\u003cli\u003eCalcium and hardness-related measurements in treatment and boiler water\u003c\/li\u003e\n\u003cli\u003eSodium monitoring in high-purity water, boiler feed and condensate\u003c\/li\u003e\n\u003cli\u003ePotassium and nutrient analysis in agriculture, soil extracts and hydroponics\u003c\/li\u003e\n\u003cli\u003eRoutine ISE verification under a laboratory quality system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eIon-selective electrode kits, replacement ISE cartridges and membranes, ionic strength adjustors and ISE filling solutions are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"500-NH4-SH - Ammonium Ion Standard, 1000 mg\/L, 500 mL - 3200697171","offer_id":48226471084222,"sku":"3200697171","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NH4-SL - Ammonium Ion Standard, 100 mg\/L, 500 mL - 3200697172","offer_id":48226471116990,"sku":"3200697172","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CA-SH - Calcium Ion Standard, 1000 mg\/L, 500 mL - 3200697175","offer_id":48226471149758,"sku":"3200697175","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CA-SL - Calcium Ion Standard, 100 mg\/L, 500 mL - 3200697176","offer_id":48226471182526,"sku":"3200697176","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CL-SH - Chloride Ion Standard, 1000 mg\/L, 500 mL - 3200697167","offer_id":48226471215294,"sku":"3200697167","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CL-SL - Chloride Ion Standard, 100 mg\/L, 500 mL - 3200697168","offer_id":48226471248062,"sku":"3200697168","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-F-SH - Fluoride Ion Standard, 1000 mg\/L, 500 mL - 3200697163","offer_id":48226471280830,"sku":"3200697163","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-F-SL - Fluoride Ion Standard, 100 mg\/L, 500 mL - 3200697164","offer_id":48226471313598,"sku":"3200697164","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NO3-SH - Nitrate Ion Standard, 1000 mg\/L, 500 mL - 3200697179","offer_id":48226471346366,"sku":"3200697179","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NO3-SL - Nitrate Ion Standard, 100 mg\/L, 500 mL - 3200697180","offer_id":48226471379134,"sku":"3200697180","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-K-SH - Potassium Ion Standard, 1000 mg\/L, 500 mL - 3200697183","offer_id":48226471411902,"sku":"3200697183","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-K-SL - Potassium Ion Standard, 100 mg\/L, 500 mL - 3200697184","offer_id":48226471444670,"sku":"3200697184","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NA-SH - Sodium Ion Standard, 1000 mg\/L, 500 mL - 3200987463","offer_id":48226471477438,"sku":"3200987463","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NA-SL - Sodium Ion Standard, 100 mg\/L, 500 mL - 3200987464","offer_id":48226471510206,"sku":"3200987464","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_1000_mg_L_Potassium_Ion_Standard_Solution_a30478e792.png?v=1785337209"},{"product_id":"horiba-ionic-strength-adjustors-isa-tisab","title":"Horiba Ionic Strength Adjustors - ISA \u0026 TISAB","description":"\u003cp\u003eIonic strength adjustors for HORIBA ion-selective electrode measurements. An ISA — or TISAB in the case of fluoride — is added in a fixed proportion to both your standards and your samples so that every solution the electrode sees has the same background ionic strength.\u003c\/p\u003e\n\n\u003ch3\u003eWhy this reagent is not optional\u003c\/h3\u003e\n\u003cp\u003eAn ion-selective electrode does not respond to concentration. It responds to ion \u003cem\u003eactivity\u003c\/em\u003e, which is concentration multiplied by an activity coefficient that falls as the total dissolved salt content of the solution rises. Calibrate in clean standards and then measure a sample containing other dissolved salts, and the same concentration of your target ion will produce a different reading.\u003c\/p\u003e\n\n\u003cp\u003eAdding ISA swamps that variability. Because both standards and samples are dominated by the same high, known ionic strength, activity coefficients become effectively identical and the electrode's response tracks concentration directly. Omitting the adjustor is the single most common reason ISE results come back consistently low while looking entirely plausible.\u003c\/p\u003e\n\n\u003ch3\u003eTISAB does more than adjust ionic strength\u003c\/h3\u003e\n\u003cp\u003eFor fluoride, use \u003cstrong\u003e500-F-TISAB\u003c\/strong\u003e. Total Ionic Strength Adjustment Buffer performs three jobs at once: it fixes ionic strength, it buffers pH into the window where fluoride exists as free F⁻ rather than as HF or interfering hydroxide, and it complexes aluminum and iron, which otherwise bind fluoride and hide it from the electrode. Fluoride measurements made without TISAB are unreliable — particularly in drinking water compliance work.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable adjustors\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NH3-ISA\u003c\/strong\u003e — ammonia\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NH4-ISA\u003c\/strong\u003e — ammonium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CA-ISA\u003c\/strong\u003e — calcium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CL-ISA\u003c\/strong\u003e — chloride\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-F-TISAB\u003c\/strong\u003e — fluoride (total ionic strength adjustment buffer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NO3-ISA\u003c\/strong\u003e — nitrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-K-ISA\u003c\/strong\u003e — potassium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NA-ISA\u003c\/strong\u003e — sodium\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach bottle is 500 mL. Use the adjustor matched to the ion you are measuring.\u003c\/p\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdd the same ratio of adjustor to every standard and every sample without exception\u003c\/li\u003e\n\u003cli\u003eAdd the adjustor before measuring, and allow the reading to stabilize\u003c\/li\u003e\n\u003cli\u003eDo not carry over adjustor between solutions — rinse the electrode between measurements\u003c\/li\u003e\n\u003cli\u003ePrepare only what you will use; do not store adjusted samples for later re-measurement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eIon standard solutions, ion-selective electrode kits, replacement ISE cartridges and membranes and ISE filling solutions are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"500-NH3-ISA - Ammonia Ionic Strength Adjustor, 500 mL - 3200697174","offer_id":48226477211838,"sku":"3200697174","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NH4-ISA - Ammonium Ionic Strength Adjustor, 500 mL - 3200987466","offer_id":48226477244606,"sku":"3200987466","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CA-ISA - Calcium Ionic Strength Adjustor, 500 mL - 3200697178","offer_id":48226477277374,"sku":"3200697178","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CL-ISA - Chloride Ionic Strength Adjustor, 500 mL - 3200697170","offer_id":48226477310142,"sku":"3200697170","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-F-TISAB - Fluoride Total Ionic Strength Adjustment Buffer, 500 mL - 3200697166","offer_id":48226477342910,"sku":"3200697166","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NO3-ISA - Nitrate Ionic Strength Adjustor, 500 mL - 3200697182","offer_id":48226477375678,"sku":"3200697182","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-K-ISA - Potassium Ionic Strength Adjustor, 500 mL - 3200697186","offer_id":48226477408446,"sku":"3200697186","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NA-ISA - Sodium Ionic Strength Adjustor, 500 mL - 3200987465","offer_id":48226477441214,"sku":"3200987465","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0592\/9926\/6750\/files\/csm_500-NA-ISA_01_5fba8f3a56.png?v=1785337211"},{"product_id":"horiba-ion-selective-electrode-filling-solutions","title":"Horiba Ion-Selective Electrode Filling Solutions","description":"\u003cp\u003eInternal filling solutions for HORIBA ion-selective electrodes. Each ISE requires its own specific electrolyte in the internal chamber — the solution is matched to the ion being measured and is not interchangeable between electrode types.\u003c\/p\u003e\n\n\u003cp\u003eThe filling solution sits behind the sensing membrane and provides the stable internal reference against which the sample is compared. As it becomes depleted or contaminated the electrode slows down, the calibration slope degrades, and readings begin to drift. Replacing the filling solution is routine maintenance, and it is usually the first thing to try when an ISE that used to work well starts calibrating poorly.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable filling solutions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NH3-IFS\u003c\/strong\u003e — ammonia electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CA-IFS\u003c\/strong\u003e — calcium electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CL-IFS\u003c\/strong\u003e — chloride electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-F-IFS\u003c\/strong\u003e — fluoride electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NO3-IFS\u003c\/strong\u003e — nitrate electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-K-IFS\u003c\/strong\u003e — potassium electrode filling solution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach bottle is 500 mL. Always use the filling solution specified for your electrode.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to replace it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe calibration slope has fallen outside the acceptable range\u003c\/li\u003e\n\u003cli\u003eResponse has become slow, or readings drift instead of settling\u003c\/li\u003e\n\u003cli\u003eThe solution looks discolored, cloudy, or has visible crystals or deposits\u003c\/li\u003e\n\u003cli\u003eThe electrode has been in storage and is being returned to service\u003c\/li\u003e\n\u003cli\u003eFollowing any membrane or cartridge replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFill to the level specified in the electrode instructions — over- or under-filling both affect response\u003c\/li\u003e\n\u003cli\u003eExclude air bubbles from behind the membrane; they break the internal circuit\u003c\/li\u003e\n\u003cli\u003eDo not substitute a different ion's filling solution, or deionized water, for the correct electrolyte\u003c\/li\u003e\n\u003cli\u003eRecalibrate after replacing the filling solution, using standards with the matching ionic strength adjustor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eIon-selective electrode kits, replacement ISE cartridges and membranes, ion standard solutions and ionic strength adjustors are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Filling solutions for reference and combination pH electrodes are listed separately.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"500-NH3-IFS - Ammonia Electrode Filling Solution, 500 mL - 3200697173","offer_id":48226482553022,"sku":"3200697173","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CA-IFS - Calcium Electrode Filling Solution, 500 mL - 3200697177","offer_id":48226482585790,"sku":"3200697177","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CL-IFS - Chloride Electrode Filling Solution, 500 mL - 3200697169","offer_id":48226482618558,"sku":"3200697169","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-F-IFS - Fluoride Electrode Filling Solution, 500 mL - 3200697165","offer_id":48226482651326,"sku":"3200697165","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NO3-IFS - Nitrate Electrode Filling Solution, 500 mL - 3200697181","offer_id":48226482684094,"sku":"3200697181","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-K-IFS - Potassium Electrode Filling Solution, 500 mL - 3200697185","offer_id":48226482716862,"sku":"3200697185","price":92.0,"currency_code":"USD","in_stock":true}]}],"url":"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories.oembed?page=2","provider":"EnviroTech Services","version":"1.0","type":"link"}