I am not sure why I bought this except to just be prepared. Then I caught Corona Virus and it was a god send. My entire family got sick at Thanksgiving. Everyone was better within a few weeks. Mid January 2021 I am still coughing my lungs out. Obviously doctors don't want to go near me. They monitor me by phone and were delighted to find I had my own O2 meter. If my O2 drops to 94 they want me to call an ambulance. I use this meter constantly and it works great.
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