AYZ Automobile Cylinder Stethoscope Car Engine Tester | Hearing Tool Repair Set Kit

Metal Probe: A rigid rod (often stainless steel) used to touch suspected noise sources. Many models, such as the Gear Wrench 835D Mechanic's Stethoscope, feature screw-on extensions to reach deep into confined engine bays.
Sound Chamber: A diaphragm or amplifying chamber that converts physical vibrations from the probe into audible sound.
Acoustic Tubing: Heavy-duty vinyl or PVC hollow tubes that transmit sound from the chamber to the user’s ears.
Earpieces: Comfortable rubber earbuds designed to reduce outside noise, allowing the user to focus on the internal machinery sounds.