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    Withings ScanWatch

    Dec 14, 2020 2 minutes
    Ben Mansill

    $479 (38mm), $499 (42mm), withings.com

    Every smart watch and fitness band out there will tell you your heart rate, which they do via optical sensors that look at blood vessels to measure variation in blood flow. Fidelity is generally low, but absolutely good enough for taking a quick

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