I have the 9 and it’s solid. As others have said the 10 won’t be coming out for almost a year. I’d say go ahead and get the 9; if the next watch turns out to be really fantastic as others have said you can trade the 9 in.

It does exist but not solely through the phone. If you get a device like the Freestyle Libre (I think there are others) you can get noninvasive readings on the phone. We used it on our dog that had diabetes.

I don’t have diabetes but my dog did. There are implantable devices (the one we used on our dog was a Freestyle Libre) and they will work with an app on your phone (and maybe your watch, I’m not sure about that). The watch itself cannot monitor your blood sugar.