The Rola-Chem 550136 8-Foot ORP Heavy-Duty Probe is a replacement ORP probe for the digital and analog controller system of Rola-Chem including Generation II Digital Controllers Digital pH/ORP Controller MODEL RC554XP, Digital pH/Dual ORP Controller MODEL RC554XXP, Digital ORP Controller MODEL RC554X, pH Liquid Acid/ORP Liquid Chlorine System, Digital pH/Dual ORP System, ORP Only Liquid Chlorine System, pH/ORP Salt Generator System, and pH/ORP Erosion Feeder System. This ORP Probe has an 8-foot cord. ORP (Oxidation reduction potential) measures the oxidizing capacity in water.
