Qty: â€Â¢ Provides a fast and easy way to locate noises in engines or bearings and other moving parts. â€Â¢ Aluminum alloy probe/needle for finding the exact location of specific noises. â€Â¢ Instrument is shockproof. â€Â¢ Ideal for pinpointing unusual vibration or suspected leaks. (valves, piston ring, gaskets etcâ€Â¦)