This response worried me so I went out to purchase a pulse oximeter yesterday. I've tried it a couple times, before and after various activities, and the number

This response worried me so I went out to purchase a pulse oximeter yesterday. I've tried it a couple times, before and after various activities, and the number is usually at 99 or 100. The lowest number I've measured is a 97, but that was after wearing an N95 mask for an extended period of time; and I was able to quickly get that back up to 100 after taking a few deep breaths. But these measurements have all been taken while my CO2 meter showed a value of less than ~600ppm, so I'll have to run a few experiments with closed doors and windows to check if higher CO2 levels have an impact. I've also made a note to discuss this topic with my doctors, just as a precaution.