Background Measurements Beyond manual checks, the watch can take readings in the background while you sleep. The waveform perfusion index (PVI) is often displayed alongside the reading, indicating the signal strength.
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The back crystal of the watch houses four LEDs and four photodiodes that work together to emit light and measure reflections. This feature is particularly useful for identifying potential sleep disturbances.
Troubleshooting Common Issues If the reading fails, ensure your wrist is relaxed and your arm is at heart level. Ensure the "Measure Blood Oxygen" setting is enabled in the Watch app.
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Cold weather can also impact sensor performance, so warming up your wrist before measurement can help. The app records the result, timestamp, and your heart rate, allowing you to track trends over time in the Health app.
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