Even a meter isn't all that accurate. I've taken two readings in a row and they're not the same. I didn't do the math but they were probably within 5% of one another.
A meter without requiring needles would be far better.
I'm guessing that someday they'll be able to take the reading with something like those things in the hospital that clip onto your finger and measures your oxygen level.
I went to a biker bar. It was weird, Their tattoos keep changing colors. They didn’t know who to fight next.
I’ve got 3 of them meters and have never had them all agree...like you said, within 5% or 6% I’d guess, and they have all been “calibrated”. Hmm.
Nothing like “practicing” medicine. Practicing!?!?!? I had been hoping that the practice sessions were over. Yikes!