We still await an acceptable blood glucose monitoring watch, but this has not stopped some marketers from claiming their watches can be use "for reference purposes".
This may not be a scientific test but does at least demonstrate how far out these watches can be, and that they in no way should be used really for blood glucose monitoring.
You get what you pay for, and some form of medical clearance is really what you want to use.
See
https://youtu.be/sWadFt4vBtY?si=mRk2DsyxIa8HqJMV
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