pHydrion CM-240 Hydrion Chlorine Test PaperBox of 10 Reliable and economical means to measure sanitizer strength Test strips are available to test quaternary ammonium, chlorine and iodine based sanitizers Strips provide a visual color change indication of solution strength Each 15 ft (4. 6 m) roll comes with a color match chart and is clearly labeled Test Type: Roll Number of Tests: 100 Solute Identified: Chlorine