ArPe
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If your blood oxygen is dangerously low, you'll feel it. It will be so obvious to you that you will not have to check your watch for it.
Also, Apple Watch can only check between 70% and 100%.
It was a typo. I meant to type 80%.
People feel lots of things that make them woozy. But having the data on hand to confirm what is happening in your body is super important.
Here is one healthy gym owner who was infected. His blood oxygen fell to 86% and he posted the below shortly before falling into a coma.