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Hi,
An honest question. Do I need to re-calibrate after updating the firmware?

I am asking because it is going to be a pain it does.

Currently running P4 with 4 probes, 3x Doser 2.1.
...

Is it possible to use 2 PH probes at the same time?

I intend to use 1 probe to monitor tank PH and the other to regulate CO2.

If so, how do I go about doing this?

Any help is appreciated.