The STEELMAN EngineEAR II features a decibel meter with 7 sound level control settings from 60 decibels to 120 decibels. Supersensitive noise pick-up with high to low settings allows user to quickly pinpoint noise and location of worn bearings and bushings, noisy valves and lifters, broken or worn gear teeth, faulty fuel injectors, wind or air leaks, annoying squeaks and rattles. (Batteries Included) STEELMAN is an industry leader in automotive and industrial specialty tools and equipment, manufacturing the highest quality, unique, and innovative tools and products, designed to meet the specific needs of mechanics, contractors, and other working professionals.