The professional water quality test kit is an inexpensive, safe, easy-to-use and reliable means to check water quality at home with instant results. Accurately monitors municipal and well water as well as the efficiency of home water filtration devices and is recommended for use every 3 months. Kit contains 18 instant test strips, which can perform 9 different tests, enough strips for testing 2 samples of each test. This test has been laboratory tested for accuracy.