Noble QT-40 Quaternary Test Paper is the perfect solution for a simple, reliable, and economical test to measure the concentration of Quaternary Sanitizers. The easy-to-use test paper colour matches at 0-150-200-400-500ppm (parts per million), measuring solutions between 0-500ppm so you can detect exhaustion of solutions that should be replaced as well as help avoid using excessive amounts of sanitizing agents. To remain in compliance with health regulations and meet manufacturer specifications, a dependable test kit such as ours is required by food service industry professionals to verify proper concentration of their sanitizer solutions - ensuring they are perfectly equipped with all they need to maintain the highest levels of sanitation when it matters most.