I bought this kit when I was cycling my tank, but have not used it since, so there is still plenty more tests to be made from it, I don't want to see it go to waste. This is one of the most recommended aquarium testing kits available; it measures PH levels, ammonia levels, Nitrate and Nitrite levels accurately using liquid drops added to the aquarium water in a test tube. Includes instruction manual. It expires 2018.