features and benefits: lets you hear sounds at frequencies you cant hear unaffected by wind and surrounding noises detects leaks down to 1.2 cfh and .003" openings ruggedized handheld portable unit complete setup for air and contact probe applications ultrasound technology allows smart cost effective preventative maintenance and quick findings of potential or existing problems in major areas like air/vacuum leaks electrical noise friction wear seal/fit integrity and fluid turbulence.