I think using the Quantified Scientist's YouTube reviews as reference for the quality of sensors is misleading.
He primarily tests the devices on just his own body type, and often doesn't test long enough for the device to adapt to him (some devices take a few weeks to "learn" your body).
He does make disclaimers about the above, but people seem to take the stats he presents as gospel.
He primarily tests the devices on just his own body type, and often doesn't test long enough for the device to adapt to him (some devices take a few weeks to "learn" your body).
He does make disclaimers about the above, but people seem to take the stats he presents as gospel.