Industrial Test Systems’ US EPA-approved SenSafe” Free Chlorine test system combines a wide range of detection with patented Free Chlorine indicator. Designed to resist interference from monochloramines, the product features a broad detection sensitivity range to determine if the correct amount of sanitizer is present. Sold in bottles of 50 test strips and in 30 individually wrapped packets with a color chart card (part # 481126), both with a detection range of 0.0, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.2, 1.5, 2.0, 4.0, 6.0 mg/L.www.sensafe.comits@sensafe.com