Brand: Lisle Manufacturer's Part Number: 52750 Part Type: Stethoscopes Product Line: Lisle Automotive Stethoscopes Summit Racing Part Number: LIL-52750 UPC: 083045527503 Quantity: Sold individually. Lisle Automotive Stethoscopes Check your engine's vitals with Lisle stethoscopes. These dual-purpose kits will detect both mechanical and air-induced sounds. They include a black diaphragm chamber and screw-in metal probe to detect mechanical sounds from bearings， engines， and transmissions. Or， attach the included hollow tube and funnel assembly to the vinyl hose to amplify and detect noises from vacuum leaks， exhaust leaks， air leaks， and wind noise. For hard to reach locations， remove the funnel and use the hollow tube.