The chance that a ring form factor wearable will be the first to reliably, non invasively measure glucose is zero. Yes they got SpO2 and HR, those are easy and

The chance that a ring form factor wearable will be the first to reliably, non invasively measure glucose is zero. Yes they got SpO2 and HR, those are easy and well established technologies. But blood glucose? Forget it. A ring form factor is too aggressive and difficult of a target.