The KH Director measures exactly according to the prescribed procedure for determining the KH value by titration and pH measurement, we assume that the absolute value matches very well, provided that the calibration of the pumps and pH electrode was correct.

Surely there will be deviation from what one expects or has always measured, because the several ways we tested to determine the KH value showed a total difference of over 2dKH. We did a lot of comparative measurements.

So if you agree more to other measurement methods, you can manipulate the value displayed by the KH Director as follows:

-> change the calibration of the reagent pump

If the displayed value is too low then enter a smaller flow rate

Example: Value appears to be 10% (7.2 is displayed, 8 would be better) too small, then reduce reagent pump flow rate by 10% (for example, instead of 4.4ml 4.0ml)


we will add this personal offset in a later firmware, then you can save yourself the manipulation in this way