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Continue to ChatPolar OH1 measures your heart rate through your arm https://www.stuff.tv/hot-stuff/wearables/polar-oh1-measures-your-heart-rate-through-your-arm/
Polar OH1 measures your heart rate through your arm https://www.stuff.tv/hot-stuff/wearables/polar-oh1-measures-your-heart-rate-through-your-arm/