Overall - I like this kit. I don't have a lot of experience with other water testing kits, but it seems to work well and is pretty easy to use. The only thing I would change would be to include a color target. Many of the tests have you add 5/6 drops of a certain substance to the water under test, which will change the color to, say, purple. Then you are supposed add any number of drops required to change the color to say, blue. The hard part is that my perception of blue may be different than yours. Having a color target of the expected blue would be helpful to say that the water under test has reached the correct color. Now count the number of drops and that is your ppm concentration of the say chloride. Additionally, my sulfate test was almost indistinguishable from the 0-25ppm test, meaning it is anywhere in between. This makes it kind of difficult when trying to figure your sulfate / chloride ratio.