I purchased this because I had been sick for a while and started having trouble breathing. I thought it was just me being paranoid.. but sure enough, I had readings between 88 and 94 for O2 sat. I contacted my doctor and she told me to go to the hospital. I thought maybe it was just a faulty meter and had my husband and roommate test theirs. They were both over 95. I was being stubborn and waited til the next morning. When my O2 sat dropped to 80 we called 911. Had I not gone to the hospital that morning, I would have died. I could not be more thankful for this little device. It definitely saved me!
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