A Pocket ORP (Oxidation-Reduction Potential) tester is a portable device used to measure the ORP of a solution. ORP is a measure of the ability of a solution to act as an oxidizing or reducing agent. In practical terms, it indicates the potential for electron transfer in a chemical reaction.The device has  electrode that is immersed in the solution being tested.When the electrode comes into contact with the solution, it generates a voltage that is proportional to the ORP of the solution. The device then converts this voltage into a numerical ORP value. The ORP value is usually displayed on a digital screen.Connector-BNC;ORP measurement range(-999) to 999 mV;ORP accuracy-± 2 mV;ORP calibration points-1 point (only for relative mV mode)  for more visit labtron