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Sure-Flow® Epoxy, gel-filled submersible pH/ORP/Temp Electrode. Provides all the benefits of the Orion 617800 but offers a free-flowing liquid to liquid junction that never clogs. Recommended Use: Ideal when glass is undesirable or prohibited. For viscous samples, semi-solid materials, slurries or emulsions. For use with Orion 555A, 535A, 635, 630 meters only. Orion pHuture probe utilizes solid-state technology to measure listed parameters. The pHuture probe is an active, electronic device where the potential developed at the sensing surface is dependent on solution pH, ORP or conductivity. This surface potential induces a measuring transistor to determine the pH or other parameters of the solution. Temperature is simultaneously monitored at the precise point of measurement, minimizing temperature error. The change in potential and temperature are translated into a temperature compensated pH or other parameter reading by the meter.