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Hanna Free Chlorine Checker - HI701 Algae Scrubbers add the foam filter andHanna Free Chlorine Checker HI701 The Hanna Free Chlorine Checker HI701 is a compact handheld colorimeter for measuring free chlorine from 0. 00 to 2. 50 ppm. It provides a direct digital result and is useful for checking source water, treated water, drinking water, pools, spas, and other applications where free chlorine needs to be monitored accurately. HI701 Free Chlorine Digital Testing Free chlorine is the active disinfecting form of chlorine in