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Apple Watch Series 4 or later also has built-in electrodes in the Digital Crown and the back of Apple Watch, which can measure the electrical signals across your heart when used with the Heart Rate app or the ECG app. When you place your finger on the Digital Crown, it creates a closed circuit between your heart and both arms, capturing the electrical impulses across your chest.
To use the electrical heart sensor to measure your heart rate, open the Heart Rate app and place your finger on the Digital Crown.
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