This metal probe is an ultra-sensitive pick-up which allow the user to quickly pinpoint problematic noises and locations of worn bearings and bushings, noisy valves and lifters, broken or worn gear teeth, faulty fuel injectors, wind or air leaks, or other annoying squeaks and rattles. This is a replacement part for the STEELMAN 65001 EngineEAR, 06800 EngineEAR II, 06606 ChassisEAR/EngineEAR Combo, and 06608 ChassisEAR/EngineEAR II Combo. The STEELMAN EngineEAR and ChassisEAR family of Diagnostic Tools which help technicians listen to and isolate unwanted noises and vibrations.