I agree with the others on the test kits. I use API liquid kits and like them, much more accurate than strips. One thing to watch for though if you buy the test kit local is to look and see what the exp date is, it's located on the bottles in the kit. They are usually good for about 4-5 yrs but always try to look for the "freshest" one you can find because sometimes they will sit on the shelf at LFS for quite awhile.