Which instrument is used to listen to heart and lung sounds?

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A stethoscope is used to listen to heart and lung sounds. It enables auscultation, letting a clinician hear heartbeats, any murmurs, and lung breath sounds, including wheezes or crackles, to assess cardiac and pulmonary function. The device has a chest piece with a diaphragm for high-frequency sounds and a bell for lower-frequency sounds, connected by tubing to earpieces. Placing it on the chest or back provides amplification of internal noises for a clearer assessment. The other instruments serve different purposes: an otoscope checks the ear canal and eardrum, a sphygmomanometer measures blood pressure, and a thermometer measures body temperature.