Car stethoscope engine diagnostic tool is ideal. Quickly locate engine noise sources and track sound anomalies in the flow of water, oil, gas and steam. Suitable for identifying broken gaskets, damaged pulleys, damaged gears, defective valves, failed water pumps, and other defective or damaged parts that cause strange noises and incorrect operations. Whether you're a professional mechanic or a hobbyist, the car stethoscope engine diagnostic tool is ideal for pinpointing problems inside your engine; perfect for pinpointing sounds like oil, water, air, steam and moving parts. The mechanical automatic stethoscope features an ultra-sensitive noise diagnostic probe and comfortable earplugs to locate faults within the engine block and easily detect problems. The cylinder stethoscope is suitable for diagnosing abnormal engine noises and amplifies the sounds, allowing you to easily find internal engine problems. Product material: plastic + metal