Engine Cylinder Stethoscope - Automotive ToolFeatures: Material: Made of quality materials, rust-proof and sturdy. High performance: The stethoscope has an extended probe that can easily detect the depth of the cylinder or engine, hard-to-reach locations. Purpose: Cylinder stethoscopes provide a quick and easy way to identify problems in bearings, motors and other moving part Easy Installation: The engine hearing tool is easy to install,can directly replacement for the old or broken one,perfectly match to your original. Application: It can diagnose the engine, cylinder, etc. of cars, trucks, motorcycles, etc. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: plastic and stainless steel Probe length: about 30cm Probe diameter: about 3.3 mm Detection frequency: 10hz-10khz