Bad electrodes
Today I discovered that my pH and redox electrodes was no longer possible to calibrate.
This judgment is done automatically by the IKS Aquastar, it is a bit of PITA because if you do it manually it’s possible to get a fairly OK calibration even om quite bad electrodes.
The pH electrode was not a problem because i had spare ones at home but the redox one was worse, but i think i will find a new one fairly easy.
