Stethoscope Cardiology is an acoustic medical instrument used to hear sounds made by the heart, lungs, and intestines. 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. Using a stethoscope to hear sounds is called auscultation Stethoscope Cardiology has both side Diapharm. Stethoscopes have earpieces, which aid comfort and create a seal with the ear, improving the acoustic function of the device.