I did the test once with most meters I still had laying around: ballpark correct but according to them my blood sugar level was between 3.8 and about 7 mmol/l.

I did the test once with most meters I still had laying around: ballpark correct but according to them my blood sugar level was between 3.8 and about 7 mmol/l. I have one which is very finacky in the 4.0 and lower range which is annoying if you want to know if it really starting hypoglycemia or you are just tired.