I can tell you that BPM is very accurate. I have a real BPM monitor, which is as accurate as the ones at hospitals and this watch is bang on with it. As well, when doing tests, I do 2 things. Once, compare to the other device while, at the same time, taking my pulse manually. HOWEVER, the Sp02 (oximeter) is FAKE! It's always somewhere between 96% and 99%, even when my oxy is at 90%-92%. My real oximeter, again, I've compared to the ones at the hospital and it's right on. This watch also does something that I did not expect and it turns out to be a very good thing. Sometimes, I get tachycardia in very short bursts. To my great surprise, this watch picks it up via the "max" number (2 swipes left). I came from expensive smart watches that were just crap and decided enough was enough. So I bought this "cheapy" with the idea that it wouldn't work well either, but at least I'd have the date/time. It surprised me! Other than the Sp02, it really works well. ESPECIALLY the sleep monitoring! I can say that this work as well as my old FitBit did. In fact, I have a high suspicion that they copied the code for that. Just a thought.
@@psstart3720 I do understand how it works. Sadly, on this watch, it does not work at all! I've run many tests and it's always at 97% +/- 1%, even when actual Sp02 is say, 92% or lower. I have a real Oximeter that works well and is as accurate as the ones I've tested it against at the hospital.. So sorry, this watch does not implement it right.
