The In-Situ^® pH sensor is a combination, single-junction electrode that contains a replaceable junction and refillable reference electrolyte solution.

The In-Situ pH/ORP sensor is a combination, single-junction electrode that contains a platinum ORP sensor, a glass pH sensing bulb, a replaceable junction and refillable reference electrolyte solution.

Both sensors are designed and manufactured for long‑lasting, accurate results in a variety of environmental waters.