I'm curious, how accurate are the sensors in smartwatches (heart rate, movement, oxygen)? For example, how does the ECG mode work? I've heard there can be significant differences between the guaranteed data and real-world usage data. What are your observations?
How do the sensors in smartwatches work?
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I heard that they measure blood flow in your veins by shining light in a heart rate sensor, but I couldn't fully grasp how the ECG mode works.