. . Features:. A must have tool to diagnose those hard to identify engine issues and trouble codes along with other internal problems. Designed with a sound chamber that amplifies sound, which allows for easy use. Two- piece probe extends to 11-3/4 allowing user to reach those hard to get to spots. Heavy duty vinyl tubing along with shockproof ABS plastic ends. Designed to fit with 1⁄2 inch male and female drives. . Description:. The Mechanic's Stethoscope is a must have tool to diagnose those hard to identify engine issues and trouble codes along with other internal problems. Designed with a sound chamber that amplifies sound, which allows for easy use. Two- piece probe extends to 11-3/4 allowing user to reach those hard to get to spots. Heavy duty vinyl tubing along with shockproof ABS plastic ends.