A stethoscope was a medical device used by doctors to listen to the sounds made by a patient's heart and lungs.
In 2151, the surgeons at Starfleet Medical, including Phlox, wore stethoscopes while treating the Klingon Klaang. (ENT: "Broken Bow")
Q wore a stethoscope when he appeared to Captain Jean-Luc Picard dressed as a doctor in 2369. (TNG: "Tapestry")
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