👍Single Roll Hydrion Quat Check Test Paper provides a simple, reliable, and economical means to measure the concentration of Quaternary Sanitizers, specifically Alkyldimethylbenzyl ammonium compounds, Rocall II, and Hyamine 3500. 👍The Color matches within the Hi Range cocentration at 0-200-400-600-800-1000ppm (parts per million). 👍Test kit is used for detecting exhaustion of solutions that should be replaced as well as helping to avoid using excessive amounts of sanitizing agents. 👍Each consisting of one (1)15-foot roll of test paper and matching color chart. Provides for approximately 150 tests per roll. 👍Dip the strip into the sanitizing solution and remove at once. Immediately compare the resulting color with the enclosed color chart which match concentrations of 0-200-400-600-800-1000ppm.