What's the best way to measure these?
It is, but it offers 5 accurate tests in one box, although the high range pH is mostly redundant for some people, like me, who don't have high pHHaha of course. Master test kit is a little misleading I think. Lol
True, but it's the upfront cost of say 30-40 instead of the 25-30 it already is.You would think the master test kit would have it all. But we can only test 4 things with it.