Mechanics Engine Diagnostic Stethoscope Tool Sonarscope Sound Noise Detector Mechanic Listening Tool Set Kit Used to Identify: Piston slap worn gears, faulty valves, water pump failure, damaged gaskets and detective bearings Listen for trouble by tracing sound of flowing water, oil, gas, or steam Locates source of engine noise quickly Handle is shockproof New Style; Disassembles for storage