Actually, I’m a veterinarian...the syringes in all of the test kits I have are medical grade, I use them daily. They should be accurate with a small margin of error. I use syringes exclusively to measure the 10ml, mostly because it’s easier .I’m well aware they don’t make them....
and those little plastic syringes are not the same as used in the medical field so not comparable
Having said that, I agree with you about the difficulty in making the glass vials that accurate, but repeatability is definitely the key here.....