The Hydrion Sanitizer Test Center is a test kit for measuring sanitizer concentration in food service applications. It includes tests for chlorine, iodine, and quaternary ammonium sanitizers. The kit contains 100 tests each for free chlorine, total chlorine, iodine, and quaternary ammonium. It allows quick and accurate on-site testing to ensure proper sanitizer strength. The tests are easy to use colorimetric tests that work by dipping the test strip into the sanitizer solution and comparing the resulting color to the color chart to determine concentration. This allows food service operators to monitor their sanitizer solutions to maintain proper food safety.