{"product_id":"myron-l-ultrapen-replacement-sensors-pt2-pt3-pt4-pt5-and-pt6","title":"Myron L Ultrapen Replacement Sensors — PT2, PT3, PT4, PT5 and PT6","description":"\u003cp\u003e\u003cstrong\u003eUser-replaceable sensors for Myron L Ultrapen and UltrapenX2 pocket testers.\u003c\/strong\u003e When a pen slows down, drifts, or stops holding calibration, the sensor — not the instrument — is almost always the part that has reached end of life. Each sensor installs in the field with the instructions supplied in the box; no return-to-factory service required.\u003c\/p\u003e\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cp\u003eKeep a spare sensor with any pen that lives on a sampling route. pH and ORP sensors are consumable by design (typically 6–12 months of regular use, less in hot or fouling water); DO and nitrate sensors last longer but still age. Pens using the same sensor family across the wired PT and Bluetooth PTBT models share these part numbers.\u003c\/p\u003e\n\u003ch3\u003eWhich sensor do I need?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPT2\u003c\/strong\u003e — pH, with the porous liquid-junction design used in PT2 \/ PTBT2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPT3\u003c\/strong\u003e — ORP \/ redox, 99.9% pure platinum electrode, PT3 \/ PTBT3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPT4\u003c\/strong\u003e — Free Chlorine Equivalent, PT4 \/ PTBT4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPT5\u003c\/strong\u003e — dissolved oxygen, PT5 \/ PTBT5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPT6\u003c\/strong\u003e — nitrate, PT6 \/ PTBT6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOM5K\u003c\/strong\u003e — membrane, fill solution and syringe service kit for the PT5 DO sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDocumentation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.myronl.com\/wp-content\/themes\/myron_l_theme\/dl\/RPTXI.pdf\" target=\"_blank\" rel=\"noopener\"\u003eUltrapen Sensor Replacement Instructions (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.myronl.com\/wp-content\/themes\/myron_l_theme\/dl\/RPT5I.pdf\" target=\"_blank\" rel=\"noopener\"\u003eRPT5 DO Sensor Instructions (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003eAlso order pH\/ORP Sensor Storage Solution and the matching calibration standards from \u003ca href=\"\/collections\/myron-l-parts-accessories\"\u003eMyron L Parts \u0026amp; Accessories\u003c\/a\u003e.\u003c\/p\u003e","brand":"Myron L Company","offers":[{"title":"RPT2 — pH Sensor for PT2 \/ PTBT2","offer_id":48464502948030,"sku":"MYR-L-RPT2","price":106.0,"currency_code":"USD","in_stock":true},{"title":"RPT3 — ORP Sensor for PT3 \/ PTBT3","offer_id":48464502980798,"sku":"MYR-L-RPT3","price":128.0,"currency_code":"USD","in_stock":true},{"title":"RPT4 — Free Chlorine Sensor for PT4 \/ PTBT4","offer_id":48464503013566,"sku":"MYR-L-RPT4","price":172.0,"currency_code":"USD","in_stock":true},{"title":"RPT5 — Dissolved Oxygen Sensor for PT5 \/ PTBT5","offer_id":48464503046334,"sku":"MYR-L-RPT5","price":283.0,"currency_code":"USD","in_stock":true},{"title":"RPT6 — Nitrate Sensor for PT6 \/ PTBT6","offer_id":48464503079102,"sku":"MYR-L-RPT6","price":294.5,"currency_code":"USD","in_stock":true},{"title":"DOM5K — PT5 Membrane, Solution and Syringe Kit","offer_id":48464503111870,"sku":"MYR-L-DOM5K","price":107.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/envirotechonline.com\/products\/myron-l-ultrapen-replacement-sensors-pt2-pt3-pt4-pt5-and-pt6","provider":"EnviroTech Services","version":"1.0","type":"link"}