I have done the following test:
On the arm the band recording PulseOX = 89%
On the finger (same time the band records) best Beurer PulseOximeter = 97%
Repeated the test:
On the arm the band recording PulseOX…
My sleep patterns are very much like yours, according to the Vivosmart 4. But, my personal experience is that I'm well rested most nights, so deep sleep must be longer than 1/2 hour. I suspect the device has trouble measuring deep sleep accurately.
I have done the following test:
On the arm the band recording PulseOX = 89%
On the finger (same time the band records) best Beurer PulseOximeter = 97%
Repeated the test:
On the arm the band recording PulseOX = 91%
On the finger (same time the band records) best Beurer PulseOximeter = 98%
So Pulse OX measurements seems a bad joke.
Deep sleep was always 2-10 minutes until software version 4.40.
After is 1-1.5 hours/night.
So very expensive pedometer it is.