2Pcs Automotive Mechanic Stethoscope Engine Stethoscope Tool for Cars, Trucks and Motorcycles Mechanics stethoscope constructed from heavy-duty vinyl tubing and ABS plastic ends. 2 Pack / packing. This engine stethoscope set contains 2 metal probes: 3.5 inch and 8.5 inch, extending to 12” long, easily reaching hard-to-access spaces. Mechanics Auto Stethoscope features a highly sensitive noise diagnosing probe with comfortable earbuds for locating issues within the engine block, effectively detecting problems. Useful for identifying broken gaskets, bad pulleys, damaged gears, defective valves, water pump failures, and other defective or damaged parts that cause odd noises and faulty operation ???? A quick compatibility check with us before ordering saves you time and hassle later.