I guess...
If it is a galvanic induced voltage, then I may not want to build a circuit that induces a voltage, which may accelerate the process. I could build something with a needle indicator, stuck to a 5 1/4 plate, with a push button to check the pH.
All we'd have to do, is press the button once in a while, to check the pH. It could be PSU or battery powered. It could be built around a 1/2 inch copper tee, like the overclocker flow sensor (without the cork plug, thank you!).
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