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The watch is usually shipped with the cover, so unless you removed it or it accidently fall off I would check again.
I thought from reading this thread that most people were finding that the Bangle bpm was lower than manual measurements
Thats because of noise due to motion artifacts, e.g. when walking with 60 BPM with heart rate = 100 BPM the sensor will give you the 60 BPM walking (or a mix of both). This does not apply when sitting still.
user140377
@user140377 If there is a plastic film cover over my sensor, it is very well attached - I can't detect it.
I thought from reading this thread that most people were finding that the Bangle bpm was lower than manual measurements, but I am seeing higher - it is consistent with my watch as I had someone else wear it and got a similar answer. I'll try the LED intensity and see if it makes any difference.