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As a former aquarist I personally used the api deluxe kits (freshwater and marine). I had a digital readout of PH on my homemade "life support" system but I didn't trust it to much since the probe was a Chinese piece of crap.
Overall just buy one of the api kits for like 30 bucks.
Just a few questions are fish involved? Saltwater, or freshwater. What exactly are you trying to test.
I have experience in the hobby. I have bred seahorse, African cichilds, and some discus although I was never too good at breeding those pain and the butts.
I know a lot about water chemistry but I'm not super good at chemistry in General so I don't think we are coming up with a potential start up. Besides the aquarium equipment world is awful. I went to a few conventions and found a lot of professionals in the business to be snobby and rude.
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