So of course Klein said they'd pass my request onto the Meter team, but the so called meter team does not seem to want to talk to me...so I did my own investigation.
So I figured out the function of two of the many potentiometers on this meter's board. I have a picture attached.
--> The one in the purple box is for adjusting the voltage measurement. I believe only for DC voltage.
--> The one in the yellow box is for adjusting capacitance measurement.
Both of these were out of spec on my meter. I did not use a precision reference, however I did have 3 meters reading very close to each other and the Klein way far off. For capacitance, my meter was roughly 6% off my "accepted value". The spec was supposed to be +/- 3%. For voltage, I was getting around 1.3% out on a 9V battery (measuring 8.90V on other 3 meters), as a reference. Spec was +/- 0.5%
Again, please don't criticize my ghetto calibration here.
However, if anyone else needs to calibrate their own, I know for a fact what those two pots do. Also, if you just look at the board, you can probably tell what the others might do.