By using this instrument, you can quickly and accurately locate leaks in any pressure and vacuum system. Suitable for detecting cracks of pipes, valves, etc. and for tightness check for vehicle cabine, refrigerator, oil tank, and other sealed compartments. Also, it can be used to detect electrical discharge from switches, transformers, insulators, circuit breakers, relay, bus bars etc to prevent accidents. A must have tools on any workshops and mechanic to test on a variety of vehicles.