Linear Polarization Resistance Corrosion Probes are commonly used in the water treating industry and other environments where on-line corrosion rate readings are required. Linear polarization probes are suited to monitor fluctuations that occur within a system. These probes are used to monitor corrosion inhibitor effects on a regular basis. LPR probes are used in conductive environments such as water or any electrolyte. The operating principle is based on measuring the flow of current between electrodes.