Main PH probe

[Hendrikherry]

Just installed new KH director , realising when testing procedure, main PH probe that connected to my P3 keep dropping its values . Is that normal or is that something need to be done.

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[Vinny]

Main pH probe should be connected to the P3.
KHD probe must be connected to the KHD probe port.

There is no relation to tank pH changing during a KH test.

[Hendrikherry]

Yes main ph probe iis connected to p3 and khd connected to khd port.
But when khd running test , my main ph changing and when testing done it went back to normal.