When I was 19 I worked for a couple of years on a DOT survey team. Accuracy was pinpoint with a transit, level, and measuring with a 100' steel tape. Still, there was a common saying, "That's close enough for highway work!".
50 years later, I-75 is still running hundreds of thousands of cars daily and they all get where they are going!
I get an unexpected drip into the bottle here and there, but the juice is always good. I'm really careful with a 10ml mix, but with 50 and 100ml bottles the occasional extra drip doesn't ruin the mix.
I started out with 100mg mixed to 50mg because "danger!". Now after the years I've paid attention and done the math, I simply don't make mistakes big enough to matter. The biggest mistake possible was transposing the VG from one recipe to another. One was .2mg too low, the other .2mg too high, even doubled with 100mg that wouldn't be enough for me to notice vaping.
It also made me wonder how some of the spot checks of stores could be so far off. I can't imagine it was a measuring issue.
