They’ve been working on this for years. I doubt they’ll be able to get the accuracy good enough to cover for an actual meter. Sure - the tattoo will help if you spike between tests but most diabetics are going to know somethings up by then.
A meter without requiring needles would be far better.
Oh sheesh, I see the idea that you could just look at it, but there’s already a monitor that sticks to your arm & your phone tells you your blood sugar.
They would have to get a lot more precise to surpass that, although it’s not perfect ( the FreeStyle Libre).
Ho.
Lee.
Shite.