Gain confidence in your water testing results with our simple handheld colorimeter. Trust your readings now, our iodine colorimeter brings you more accurate technology than your average chemical test kit. Eliminate the struggle of determining colors visually, with our handheld colorimeter gives you digital iodine results directly. The HI718 Checker (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iodine. Introduced as an alternative to chlorine, iodine as a sanitizer decreases eye irritation in pools and saps and provides a more stable level of disinfection in adverse conditions. However, due to its toxic and corrosive properties, iodine is strictly monitored. Designed as a more accurate alternative to chemical test kits, the HI718 provides quick, accurate results in a few easy steps.