These are tools used to verify the concentration of quaternary ammonium compounds in sanitizing solutions. They typically involve a paper strip that changes color when exposed to the solution, indicating the parts per million (ppm) level of the disinfectant. For example, a strip dipped in a solution may turn a specific shade of blue, corresponding to a reading of 200 ppm on a reference chart.
The utilization of such verification methods is critical for maintaining effective hygiene practices in various settings. This ensures that surfaces are adequately sanitized, reducing the risk of contamination and the spread of pathogens. Historically, these methods have evolved from less precise techniques to provide a quick and reliable means of confirming disinfectant strength, contributing significantly to public health and safety protocols.