User-replaceable pH, ORP, and combination pH/ORP sensors for the YSI Pro Series and ProQuatro handhelds. These ISE (ion-selective electrode) sensors thread directly into your instrument's field cable — no tools required.
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1001 pH Sensor — standard analog pH electrode
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1002 ORP Sensor — oxidation-reduction potential (redox) electrode
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1003 pH/ORP Combo Sensor — combined pH and ORP in one sensor (ProQuatro only; not for use with the Quatro cable or dual ISE/Temp cable)
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1001A Amplified pH Sensor — amplified signal for longer cable runs
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1001A Amplified pH Sensor Kit — includes required guard extension for 2-port ProSeries cables
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1003A Amplified pH/ORP Combo Sensor — amplified combo sensor
Compatible with: ProQuatro, Pro10, Pro1020, Pro1030 instruments (check your cable's port configuration for compatibility).