Apple Watch Series 9: Better heart rate sensor, new chip, know what's coming at Apple 2023 event | Tech News
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Apple doubles down on heart rate monitoring with upcoming Apple Watch update; announces Stanford study | MobiHealthNews
How accurate is the heart rate monitor on the Apple Watch compared to other devices on the market? - Quora
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Apple Watch heart monitor is falsely warning people their heart is at risk, study reveals | Daily Mail Online
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