For determining the concentration of quaternary ammonium compounds in the range of 100 to 400 ppm. Users of quaternary sanitizers should have on hand a test procedure to show that their solutions have the proper and effective concentrations required. These papers provide immediate verification of the strength of the sanitizing solution. The quat testers will also detect exhaustion of solutions that should be replaced and will avoid the use of excessive and wasteful amounts of quat compound. Comes in a 15 ft. roll with a colour chart. This test paper works best in non-alkaline quats. Papers are calibrated for dimethyl benzyl ammonium chloride and similar quaternaries such as Hyamine 3500 and Roccal II.