Galaxy watch 4 Oxygen saturation surely this isn't right ... : r/GalaxyWatch
Pulse oximeter on a smartwatch: What is it, and why does it matter?
How reliable is the SPo2 readings on the Galaxy Watch 4. I'm surprised to see it this low. Can cold environments cause stuff like this? : r/ GalaxyWatch
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How to Track Your Blood Oxygen Saturation Using Wearables Like Smartwatches How to measure Blood Oxygen Saturation (SpO2) with a Smartwatch
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Does the Samsung Galaxy Watch 4 support blood oxygen monitoring? | Android Central
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Smartwatches Have Measured Blood Oxygen for Years. But Is This Useful? - CNET