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Amazon.com : Polar H10 Heart Rate Monitor, Bluetooth HRM Chest Strap - iPhone & Android Compatible, Black, Size XS - S : Sports & Outdoors
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Do Heart Rate Phone Apps Really Work? - Baltimore Cardiologists - Woodholme Cardiovascular Associates
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Wellue DuoEK ECG Monitor Heart Monitor Chest Strap, Wearable ECG Monitor, Bluetooth Wireless with iOS & Android APP, 15 Minutes Monitoring, Portable Heart Rate Monitor Mobile for Home Use (Black) : Amazon.co.uk:
![GitHub - richrd/heart-rate-monitor: 💓 A web based heart rate monitor that measures pulse from the fingertip using the phone camera. GitHub - richrd/heart-rate-monitor: 💓 A web based heart rate monitor that measures pulse from the fingertip using the phone camera.](https://raw.githubusercontent.com/richrd/heart-rate-monitor/master/screenshots/screenshot-1.png)