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Apple has long been positioning the iPhone and the Apple Watch as wellness devices — hardware that can help you track markers of fitness including exercise, step count, and even sleep and ‘mindfulness minutes’.
But now it’s taking that a step further by adding the sort of heart-monitoring technology more usually of interest to doctors — making it available to anyone with a wrist and a few hundred dollars to spare.
While previous versions of the Apple Watch have been able to measure a wearer’s heart rate, the Apple Watch 4 takes a big step up with its electrocardiogram (ECG or EKG depending on where
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