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is it a stethoscope? if it is, then my answer is correct. they don't feel cold. they check your heartbeat from different directions. the end works as a speaker. it has a tiny hole which collects sound and the ear plugs emphasize it because metal is not only a good conductor of electricity, but also a good conductor of sound waves.

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12y ago
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Q: Why does a sethoscope feel cold?
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