the concentration of a sanitizing solution should be measured using

The concentration of a sanitizing solution should be measured using a test kit, specifically test strips designed for the type of sanitizer active ingredient (e.g., chlorine or quaternary ammonium compounds). These test strips change color based on the concentration of the sanitizer in the solution, allowing the user to compare the color to a chart and determine the concentration. It is important to use the correct type of test strip tailored to the sanitizer being measured, as the strips are not interchangeable. Test kits are the common field method because they are easy to use and provide a practical way to verify the sanitizer concentration to ensure efficacy.