Pulse oximeter is totally broken with 4.70 on Vivoactive 4. Medical pulse oximeter shows me 96-100, Garmin 85-88, sometimes below 80. I am confused and angry. Measurement was correct on earlier version of firmware.
Have seen this from day 1 on my vivoactive 4, which I've been using for about a year. Never registers higher than 96%. Simply adding the ability to calibrate would address this problem.