Stethoscope [Blue] Model: MCP ST-01B ISO, CE Mark, NSIC Approved, WHO GMP The stethoscope is an acoustic medical device for auscultation, or listening to the internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces. It is often used to listen to lung and heart sounds. Aluminium Alloy Anodized 45mm Chest piece. Imported printed Diaphragam 175mm Head frame Made of 5mm thick brass pipe. Extra Soft Tight sealing ear tube. Spare Printed Diaphragm With Ear Knob.