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One thing that is cheap and pretty easy is to measure alkalinity with an aquarium gH/kH kit. You use drops to see a color change. I think they are about $6 now, and would help with knowing the carbonate hardness, to see where your alkalinity is. The other things may not change that much, and if they do that is more of a flavor issue than a mash pH issue, but the alkalinity is crucial for a good mash pH.