I don't pretend to know how most of the watch's inner functions work. But Pulse Ox is the blackest of black magics. How the hell do you get a reading? I'm not talking about whether it's accurate or if it lines up with "medical grade" devices. I just mean how to get a reading to complete, and how long it takes.

I usually take spot checks from the widget, and it seems completely random how the process will pan out. Sometimes, it says "measuring" and within 3-4 seconds presents a result, so fast it never cycles to "keep still."  Other times, it will spin for 10+ seconds, alternating between these two messages. And other times, after half a minute of trying, it'll give up completely.

I always come away thinking there's something I did (or can do) that can influence the speed/success of getting a Pulse Ox reading, but it never pans out next time I try. I've thought that maybe it's too bright, or too dark. The watch band is on too tight, or too loose. I have to hold the watch against my skin, or let it sit naturally. That the Elevate sensor surface should be wet, or dry, or sweaty, or clean. Or it should be higher on my arm, or lower. Or sitting against the wrist bone, or far from it. Or over a visible vein, or a clear patch. I've never found anything that is a reliable predictor of whether a reading will complete. About the only thing that seems consistent is if a reading doesn't finish the first time, it's unlikely to finish no matter what I do, and I should just give up and try again later. 

No, it's not important. But it's kinda driving me nuts, because it really seems like a roll of the dice :)