Wearable Heart rate Monitors and how they work Posted by JohannMac on Sunday April 02, 2017 @01:33PM from the arstechnica.com dept. https://arstechnica.com/gadgets/2017/04/how-wearable-heart-rate-monitors-work-and-which-is-best-for-you/ ( no comments | 2 points | on HN )
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