The Hickok/Waekon Universal Electronic Fuel Injector Quick Probe, No. 76462, allows technicians to detect electronic fuel injector functioning on any engine, gas or diesel. Users no longer have to search for injector wires to test at the connector or injector removal required. The probe is specifically designed to detect the vibrations emitted when the injector. Simply press the 7” long probe tip against the injector body, adjust the sensitivity using the thumb-wheel and the bright LED strobe will flash each time the injector opens and closes. The strobe allows the user to determine if the injector is firing consistently, misfiring or not firing at all.