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Smart Watch Fitness Tracker with Heart Rate Sleep Monitor, TSV Bluetooth Smartwatch Monitor Step Count & Distance & Calories Burned, Waterproof, Fit for Android iPhone - Walmart.com
![Fitness trackers accurately measure heart rate but not calories burned | News Center | Stanford Medicine Fitness trackers accurately measure heart rate but not calories burned | News Center | Stanford Medicine](http://med.stanford.edu/content/dam/sm-news/images/2017/05/ashley-euan-wearables.jpg)
Fitness trackers accurately measure heart rate but not calories burned | News Center | Stanford Medicine
![Fitness trackers accurately measure heart rate but not calories burned | News Center | Stanford Medicine Fitness trackers accurately measure heart rate but not calories burned | News Center | Stanford Medicine](https://med.stanford.edu/news/all-news/2017/05/fitness-trackers-accurately-measure-heart-rate-but-not-calories-burned/_jcr_content/main/image_0.img.full.high.jpg/wearable-trackers.jpg)