Insta Test 4 Bromine Test Strips are an easy way to check the chemical balance in your pool water. These testing strips are used to ensure safe and clean swimming water for you, and your guests. The Insta-Test Test strip will check your pool water for Free Chlorine, Bromine, Alkalinity, pH, and Total Hardness in just a matter of seconds! These test strips are specifically designed for testing swimming pool water. The stripes come in a pack of 50 so you can always make sure you’re water is safe to swim. The convenient close cap bottle top allows you to secure the strips so they don’t get wet. With these strips, it’s as easy as dip and read!