A wearable ECG device includes a band having a first and a second ECG electrode, the first and the second ECG electrodes electrically connected as a common electrode. A device body is removably coupled to the band, and has a face and a display on a first side thereof, and a third ECG electrode on an opposite face thereof. A clasp is coupled to the band to secure the device around a wrist of a user, the clasp having a fourth ECG electrode, the fourth ECG electrode insulated from the band.
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