: Digital pH Tester - fish tank Is there any digital pH tester on the market at all? I've done a search around and pet-stores and the usual companies (Fluval, API, etc) don't sell them as far as I can tell. Some companies I

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Digital pH Tester - fish tank
Is there any digital pH tester on the market at all? I've done a search around and pet-stores and the usual companies (Fluval, API, etc) don't sell them as far as I can tell. Some companies I don't recognize do sell something like this. I could be imagining it, but I seem to remember a tool in a school physics class that tested pH. I seem to remember two metal rods in the water connected to a device that measured the pH.
Any ideas?
Thanks,
Cormac.

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