Are you spying on me
It just so happens I have two meters, one a Fluke, the other a Cen-Tech.
I 'inherited' the Cen-Tech from my brother when he got it free at HF.
I assumed it was junk and never bothered to use it or check its accuracy.
After going through the thread you linked I opened mine up and it has the trim pot
A quick and dirty adjustment of the pot got me within 1m
of the Fluke.
Compared to the Fluke in a limited test I'm getting 80µA and 10mV difference. My connections are suspect so it mostly likely is better under more controls conditions.
The resolution is such that I may be getting better mV accuracy but I cant see it.
These results are much better than I expected and a welcome surprise.
Thanks for letting me know.