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Micro Essential Laboratory QT-10 Hydroid Quit Test Paper, 0-400 ppm (Pack of 10) auspowers_batchtwo Service Warranty: We guarantee thisMicro Essential Laboratory QT 10 Hydroid Quit Test Paper, 0 400 ppm (Pack of 10) Hydroid QT 10 Quaternary Test Paper provides a simple, reliable, and economical means to measure the concentration of Quaternary Sanitizers, including n alkyldimethylbenzyl and or n alkyl dimethyl ethyl benzyl ammonium chloride, and Rocall II. With color matches at 0 100 200 300 400ppm (parts per million), the test paper measures concentrations between 0 400ppm, detecting