HI 771 Checker®HC Handheld Colorimeter – Chlorine Ultra High Range The HI 771 Checker®HC is a simple, accurate, and cost effective way to measure ultra-high ranges of chlorine.  Designed as a more accurate alternative to chemical test kits, the HI 771 provides quick, accurate results in four easy steps.  1.) Step One – Add a sample to the included cuvette(s) 2.) Step ... Read More »