Super Sensitive Mechanic's Stethoscope To Help You Listen To Engine Sounds. Two-piece Metal Probe Can Extend To 11 3/4 Inches For Hard-to-reach Spots. Used By Professional Mechanics Everywhere As A Diagnostic Tool In Determining The Source Of Engine TroubleThe super sensitive ear pieces can detect the smallest noises in the engine This stethoscope is equipped with heavy duty black vinyl tubing The probe handle is made of shock resistant ABS plastic-unit weighs 6.7 ounces Great as a diagnostic tool for the auto mechanic to hear engine sounds The probe reaches up to 11 3/4 inches for access to the engine areas