below is the description of the kit as stated on a google search. says it tests .5 to 5.0 ppm chlorine??



Description:A Complete Dpd Test Kit Designed For Service People, Commercial Pool Operators And Health Dept Officials Interested In Economy & Portability. Tests For Free & Total Chlorine (.5 - 5.0 Ppm) Bromine (1.0 - 10 Ppm), Ph (6.8-8.2), Acid Demand, Base Demand, Calcium Hardness, Total Alkalinity And Cyanuric Acid. Uses 3/4 Oz Reagents. Plus Titrants To Improve Accuracy.