This is a stethoscope. It's usage is for auscultating heart sounds, lungs and breath sounds, abdominal sounds, etc. It has a bell and a diaphragm. Not all steths have bells, but all have diaphragms. The bell (the smaller head) is used in listening to low-pitched sounds while the diaphragm (the bigger and flatter head) is used in listening to high-pitched sounds.
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