I bought a pulse oximeter similar to the one in the link:
It always reads my O2 in the range of 93-95%, when I try it on other people, it reads the normal 98-99%. When I went to the hospital I asked for O2 saturation several times, the result it is normal 98-99% !!
I don't understand why the readings are different. I'm asking this because I might have sleep apnea as I have adrenaline rush every night.