Feature●Hydrion QT-40 Quaternary Test Paper provides a simple, reliable, and economical means to measure the concentration of QUATERNARY Sanitizers, particularly multi-quat broad range quaternary ammonium sanitizer solutions.●Sanitizer Test Tape for Concentrations between 0-500 ppm●This is a Sanitizer Test Tape, NOT a pH tapeDescription One Roll of Hydrion QT-40 Quaternary Sanitizer Test Tape 15 feet Roll Quat Color Chart 0-500 ppm Range New