Yes. I have a FitBit. I mainly use to check my BP under stress and my sleep quality. I’ve been told it’s not reliable for O2. But thinking of getting a better quality one to be more accurate.

NO

Hi Steve,
I have golf buddy,gives me steps and distance to the green in yard s,
I have fingers to take my pulse.
I breath hold by counting mentally and that tells me a lot about my health.
Hope you still fit and breathing through your nose.
Take care,
Kish Tura

I have a IWatch and it measures many things during the day (steps, standing time, etc) and at night it measures my 02 levels, sleep habits, and heart rate.

YES, got it to monitor my oxygen on a watch as the oximeter is akward.