I bought a cheap pulse oximeter during the pandemic and what I learned is that when I’m feeling light-headed, blood oxygen is low. So I decided that my body’s built-in blood oximeter is probably good enough most of the time.
It’s sort of like having your watch tell you whether you slept well or not. Didn’t you already know? If you think you slept well and your watch disagrees, are you going to trust its opinion over your own?
It’s sort of like having your watch tell you whether you slept well or not. Didn’t you already know? If you think you slept well and your watch disagrees, are you going to trust its opinion over your own?