KBKB wrote:I have a ~$20 Pulse Oximeter that I purchased on Amazon ZacUrate Pro Series 500DL.
I tried using that ~$20 pulse oximeter last night while on a relatively flat hike.
I have doubts about its accuracy. Most of the time, it showed a pulse of around 60 with a blood oxygen saturation in the low 90s. I was occasionally able to make it show a pulse closer to 120, which was more believable. At one point along the way, it showed that my O2 saturation had dropped into the 60s and then into the 50s, which doesn't seem likely at all.
My fingertips are callused from climbing - I wonder if that's messing it up. I found that I sometimes got more believable pulse readings when I turned it around so that the sensor was on the fingernail side. I'm pretty sure that's not how it's supposed to be used though.