Welzh Werkzeug Electric Stethoscope Heavy Duty 1197-WW. Designed to help find the location of problematic noises quickly, reducing the diagnostic time. 1 way amplifier allows for a quick and simple method of testing. Can be used on many parts of the engine including the alternator etc.Includes 6 way amplifier and colour coded probes. Alligator clips allows for use on various test points. Padded headset and band gives extra comfort for when working for extended period of time.