As a type-1 diabetic, to check my glucose, I have to use a spring-loaded device that pricks my finger with a needle which I then squeeze out to get a large enough sample, then pick up another device with a test strip attached where I collect the sample.

Read the last paragraph (0003) of the Background and then look at that watch device. If I could flip my wrist over, push a button, hear a hiss and 5 seconds later I can tell where my levels are, my day to day life, for the rest of my life, is made that much easier.