Have an Apple Watch Series 4? The built-in electrodes let you take an electrocardiogram from your watch if you’re at least 22 and live in the United States, but they can also improve general heart rate readings — regardless of where you live.

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The post Apple Watch Series 4 Heart Rate app takes ‘faster reading with higher fidelity’ using Digital Crown appeared first on 9to5Mac.

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Zac Hall

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