What great timing on this thread. Just last night I was on Amazon reading reviews. This was the one I had decided on and it's by the same company as the one SOC recommended. What I like for the added $$ is the pulse wave form info. http://www.amazon.com/Santamedical-SM-240-Finger-Pulse-Oximeter/dp/B004NAQ89K/ref=pd_sbs_hpc_3 I feel like I am waking up at night in part due to low ox, even though my sleep study went ok for this. I want to be able to spot check that and pulse without digging out the BP cuff.