The Apple Watch is not calibrated with a cuff. It takes 30 days of cardiac data from the existing optical PPG sensors, analyzes it, and gives you a probability that you might have hypertension. It’s also significant that this is the first year that the Apple Watch has had a true 24 hours of battery life, so you can wear it while you’re sleeping without taking it off to charge. I’ve turned this on with my Series 11 and have not yet gotten a notification (and hope I never will), but given that general…

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