These Ultra High Free Chlorine water quality test strips has a very high range of detection with our patented Free Chlorine indicator. Designed to resist interference from monochloramines, SenSafeâ„¢ Ultra High Free Chlorine is the ideal product when testing in a food processing environment. Ultra High Free Chlorine is perfect for determining whether or not you have the correct amount of sanitizer present. All of the reagents are impregnated on the test strip pad, and no external chemicals are needed to perform the water quality test.