![Apple Watch is most precise wrist-worn heart rate tracker at 90% accuracy, study says [u] | AppleInsider](https://photos5.appleinsider.com/gallery/18623-17833-18182-16439-160907-FL-Watch-Ceramic-l-xl.jpg "Apple Watch is most precise wrist-worn heart rate tracker at 90% accuracy, study says [u] | AppleInsider")
Apple Watch is most precise wrist-worn heart rate tracker at 90% accuracy, study says [u] | AppleInsider
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