FWIW, I've found that my blood oxygen reading very much changes depending on which watch band I'm using.
If I use my sport loop, I can almost never get a 100% reading. It tends to max out at 98% and generally reads at 95%.
If I use a nylon band with a buckle, I can regularly get 100% readings.
If I use my sport loop, I can almost never get a 100% reading. It tends to max out at 98% and generally reads at 95%.
If I use a nylon band with a buckle, I can regularly get 100% readings.