A mechanics stethoscope is a sensitive instrument, much like a doctor's stethoscope, which can be fitted with a variety of ends, including needle probes and rubber trumpets, specially designed for automotive use. A mechanic's stethoscope gives an effective and precise way to locate unusual noises in engines, bearings, or other moving parts, and to track down leaks or suspicious vibrations in valves, gaskets, piston rings, and so on. It is also a handy tool for checking vacuum and pressure flow, or for synchronizing multi carburetors.