Hello it's work 1 week good, now in KH director - 5.9 dkh, Salifert - 6.7, Hanna 6.9.
I recalibrate pump 5 time and 3 time calibrate PH, KH director same 5.8 - 5.9, same problem differences in -1 dx.
I try change Water value - same. now 50ml water and 16 reagent.
What can i do? I try many time fix it but nothing.