Hipot, or high potential, is a class of electronic test equipment used to verify electrical insulation. Engineers use hipot-testing instruments on cables, wires, circuit boards, appliances, electric motors, and transformers. As a product ages, its insulation may break down and result in current flow leakage. Hipot testers keep engineers safe from current leakages by detecting gaps and defects in the electronic device. ValueTronics.com sells used and refurbished hipot testers from Associated Research, Chroma, Fluke, and others.