I wear it on my left index finger, not on my thumb.
It also records your motion during sleep — an indication you are moving in your sleep to get more air.
Lastly, the OSCAR program that you load your CPAP data into also loads the O2Ring data so you see all of that data in one place.
I've been asked to work in a Sleep Lab...but hate working nights!!
I'm also a CPFT..Certified Pulmonary Function Technologist. But it's way boring...Interesting but boring.
The most fun and rewarding work was when I worked in a NICU....Why? Well these little one's are usually just too early...and they get better.
I work in a Swing Bed rural Hosp these days...now and then.
Thanks for the info!!