Calibrating PH probe

For some reason my Ph probe will not re calibrate, I am using new calibration fluid which was floating in my sump for over an hour to bring up to temperature, the progress bar will not go above 25%

Steve

Hi Steve,

How old is this probe?

Hi Vinny

Its about 12 months old

It should be replaced if calibration is no longer possible.

Thanks Vinny

I will buy a new probe