* Users of quaternary sanitizers are to have on hand a test procedure to show that their solutions have proper concentrations required* Provides immediate verification of the solution strength* Also detects exhaustions of solutions that should be replaced and will avoid the use of excessive amounts of quat compound* For determining the concentration of Quaternary Ammonium * Compounds in the range of 0 to 400 ppm (0-100-200-300-400 ppm) * The QT test paper works best in non-alkaline quats