Sensorex S650CD CPVC Body Submersion Flat Surface Mounted pH Electrode, 0 to 14 pH, 57/64" Diameter x 3" Length Submersible electrode with a flat surface sensor for measuring pH or ORP in tanks, sewer lines, and other water testing applications Combination electrode has a double-junction reference to protect against silver wire contamination CPVC body resists heat and corrosion, and is sealed for minimal maintenance Available in models that measure pH from 0 to 14 pH or ORP of +/-2,000mV Electrode is 3" long with a 0.90" diameter at the sensor, and has a BNC receptacle for use with a Sensorex cable assembly (sold separately) for attaching to meters with a BNC connection