As a paramedic, I have worked with pulse oximeters for thirty years in conditions ranging from sterile hospitals to mountaintops and ditches on the side of roads. I’ve watched them evolve from large, in-hospital devices to portable ambulance units to sub-$30 devices you can buy on Amazon and toss in your pocket. I’ve used them on many hundreds of patients under nearly any imaginable condition, and a few that would probably strain your credulity.
Perhaps this is why I find the new blood oxygen sensor in the Apple Watch Series 6 interesting and surprisingly accurate, even if it’s far from providing the same health and wellness value as the watch’s heart rate and ECG sensors