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Get accurate water testing results with the HI701 Free Chlorine Colorimeter. With a digital read out there is no more struggling to determine colors visually. Easier to use and more accurate than chemical test kits. One-button operation makes getting your free chlorine results simple. For use with freshwater samples Great for water quality environmental testing and pools spas. Dedicated to a single parameter Small size big convenience The HI701 CheckerHC Handheld Colorimeter is a simple accurate and cost effective way to measure free chlorine. Free chlorine is the active form of chlorine used for disinfection of drinking water swimming pools and spas and vegetable rinse water. Free chlorine in water is also harmful to a reverse osmosis membrane and needs to be monitored for removal from source water prior to being used. Designed as a more accurate alternative to chemical test kits the HI701 free chlorine meter provides quick accurate results in a few easy steps.