Features: _x000D_ 15 Seconds Quick Test _x000D_ Dip in water and take out immediately, then read test strip in 15 seconds. _x000D_ Color Chart on Bottle _x000D_ Ests in a range of 10-2000mg/L _x000D_ , (10255010020030050010002000mg/L ppm markings) _x000D_ Rapid quantitative detection of chlorine-containing water such as medical water, pool water and household cleaning water _x000D_ _x000D_ Description: _x000D_ This Free Chlorine Test Paper provides a simple, reliable, and economical means to measure the concentration of free available chlorine in water after using sanitizing solutions.The Chlorine Test Paper measures total available chlorine from 10-2000ppm, and give results in just seconds. _x000D_ Analyzes Chemical Factors: Free Chlorine _x000D_ _x000D_ Package Included: _x000D_ 1Roll x Free Chlorine Test Paper Strips _x000D_ _x000D_ _x000D_ Note: _x000D_ 1.Due to the different monitor and light effect, the actual color of the item might be slightly different from the color which is showed on the pictures. _x000D_ 2.Please forgive 1 cm/0.39"-3 cm/1.18" measuring deviation due to manual measurement.