CES 2021: Heart rate range revamped

Scosche has updated its heart rate monitoring strap with the launch of the Rhythm+ 2.0.

The Heart rate monitor fits on the arm rather than the wrist or chest – and uses optical sensors to read your bpm through the skin.

The idea is that the more solid position on the upper arm is more stable and reliable than the boney, flexy part of the wrist.
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https://www.wareable.com/health-and-wellbeing/scosche-rhythm-20-heart-rate-monitor-8260