The empty tank capacitance of the basic vans plates is relatively low so the range of capacitance from empty to full is also small leading to lack of accuracy and errors due to offsets and processing noise.
This was my experience with the Dynon C2V converters...really sucky calibration. Switched to 2-point Princeton C2Vs, and they've been dead on with no issues for 750+ hours (stock Van's capacitive plates).
Linear Mode
