OTT Hydromet - Add-on for Orckestra
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HYDROLAB pH and ORP Sensor for HL Series Sonde with Standard Reference

Product #: HLPHORPSREF
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The HYDROLAB pH sensor uses a glass bulb measuring electrode and refillable reference electrode, each in their own sonde port. A user-rebuildable reference electrode extends the life of the pH sensor while minimizing costs because the measuring electrode does not necessarily need replacement when the reference electrode is depleted.  HYDROLAB's ORP sensor uses a platinum band that donates or accepts electrons to monitor chemical reactions, quantify ion activity, or determine the oxidizing or reducing properties of a solution.

(accessory cannot be purchased as a standalone product)