Kit contains: 50 test strips, color chart & comparator, and booklet entitled The Complete Guide to Pool & Spa Care AquaChek Select is Ideal for customers who want a more complete analysis of their pool or spa water. Get 7 important test results in just one dip! Dip an AquaChek Select strip in your pool or spa water for one second and remove it immediately. You get test results in seconds! To keep you pool water clean and healthy, test the water at two ends or sides of the pool a minimum of twice a week! If used in a spa we recommend testing it before and after each use. It's also a good idea to write down your results each time you test. Tests for 7 important chemistries in seconds: Total Hardness, Total Chlorine, Total Bromine, Free Chlorine, pH, Total Alkalinity, and Cyanuric Acid.