Consumer Reports' tests confirm that the Apple Watch's heart-rate monitor is accurate : r/apple
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![Amazon.com: Apple Watch Series 3 [GPS 42mm] Smart Watch w/Space Gray Aluminum Case & Black Sport Band. Fitness & Activity Tracker, Heart Rate Monitor, Retina Display, Water Resistant : Electronics](https://images-na.ssl-images-amazon.com/images/I/71yrt3+nfkL._AC_UL600_SR600,600_.jpg "Amazon.com: Apple Watch Series 3 [GPS 42mm] Smart Watch w/Space Gray Aluminum Case & Black Sport Band. Fitness & Activity Tracker, Heart Rate Monitor, Retina Display, Water Resistant : Electronics")
Amazon.com: Apple Watch Series 3 [GPS 42mm] Smart Watch w/Space Gray Aluminum Case & Black Sport Band. Fitness & Activity Tracker, Heart Rate Monitor, Retina Display, Water Resistant : Electronics
/cdn.vox-cdn.com/uploads/chorus_asset/file/21928299/dseifert_200930_4217_0013.0.jpg "How to measure heart rate on your smartwatch - The Verge")
How to measure heart rate on your smartwatch - The Verge
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Apple Watch is most precise wrist-worn heart rate tracker at 90% accuracy, study says [u] | AppleInsider
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