Soil test kits, imo, are a friggin rip off. I mean, what youre really going to find out is what your soil ph is in conjunction with your tap water. Which really isnt your soil ph or your runoff ph.

You can pick up a ph meter at home depot for less than 20 bucks. Id recommend at least getting one of those. Also the aquarium test isnt a bad idea, at least then you can test your soil runoff/tap water and make some educated guesses on your soil ph. Like, if your runoff is an 8, then you know its to high.

Idk, thats what I would do.