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Tenpat t1_ja5nfvv wrote

As a fellow with dry hands: they don't.

They use the bit of moisture most people have on their hands to measure resistance from one hand to the other. Along that path is your heart and its beating changes the resistance so by measuring it over time the device can tell your heart rate.

But if your hands are dry then they can't get a good electrical connection and don't read anything.

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Few_SIice3225 t1_ja6brdk wrote

Do you not sweat when you work out?

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Tenpat t1_ja6fkzp wrote

I sweat pretty much everywhere fairly profusely but my hands just don't get super sweaty.

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