A stethoscope in the workshop might seem like an odd suggestion at first. But once you see what the ToolPRO Mechanics Stethoscope can do - you’ll never look back. Just like in the doctors; the mechanics stethoscope is used to pinpoint sounds and help you reach an accurate diagnosis. In place of a chest piece, the ToolPRO Mechanics Stethoscope has a steel rod with a screw on extension. Install the appropriate length for the part you’d like to diagnose; fit the earpiece - and away you go. Diagnosis will typically be done with the engine running; so be very careful where you put your hands, wear all the necessary safety equipment - and tie back long hair. Now touch the end of the steel rod to the suspect area on the motor. Keep moving it around until you find the area where the noise is strongest. If it’s a bearing; expect a loud growl. Other sounds such as knocking; can be confirmed by a professional if needed. Don’t throw away money fixing what it ‘could’ be. Grab a ToolPRO Mechanics Stethoscope, and get a spot on diagnosis the first time.