I use a Libre2 chip that has a plastic sensor going through my skin into the underlying tissue to measure the blood sugar, but it is not accurate compared to a blood sample from the finger plus there is a delay when you measure the bloodsugar in the muscle tissue compared to the finger, so I highly doubt someting sitting on the outside of the skin on the wrist can do it even closely precise, but I have a small hope - exciting technology at least. If it works just slightly reliable it is a complete game changer for all people with T1D or T2D.