Hydrion QT-10 0-400ppm Quat Check Test Strips Paper DispenserProduct features Calibrated to test the concentration of Alkyl dimethylbenzyl ammonium Compounds Roccal II, Hyamine 3500 Test solution should be room temperature (ideally 65 75 degree farhenheit) Test paper should be held in motionless solution for ten seconds Results should be read immediately Color chart shows matches at increments of 0 100 200 300 400 ppm Product description Micro Essential Hydrion QT Test has been calibrated to test the