Here is another wearable device that lets you measure your ECG, heart rate, and HRV. The HeartyPatch is an open source connected patch compact enough to attach close to your heart as you prepare to get active. It has Bluetooth and WiFi built into it.
More items like this: here
HeartyPatch is completely open source. It has a wearable design and onboard battery. More info is available here.
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