I have an Aquachem and two Taylor kits (among others). the Taylor is much easier to read and the color match much better on the comparator. IF you just want pH get a taylor K-1000 OTO and pH kit (Or Ben's PS200...basically the same kit for less money). It's very inexpensive. Otherwise get a K-2006 or better yet, get Ben's PS234...much better value for the money (and you can use the taylor reagents with it if you need to)