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How long did you hold your breath for?


Perhaps 30 seconds? It was uncomfortable but not a big strain. I see someone nearby saying 2-3 minutes. For me, it was not that long!


I bought one a few days ago (weird coincidence), from Amazon for around $35 at the advice of a friend. Skeptical also, my 97% level upped to 98-99 with deep breathing, and then I held my breath as long as I could possibly do it and it dropped to about 93-94.

That's obviously not a confirmation that it's calibrated or trustworthy, but at least it shows a relative measure that seems real in both directions of oxygen saturdation. Surely if I have a drop due to illness I should notice, even if the number isn't exact.




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