The Hanna Instruments HI 771 is a hand-held colorimeter for testing ultra high ranges of total chlorine. It is designed as an accurate alternative to chemical test à¤Ã×èͧÇÑ´¤ÅÍÃÕ¹ HI771 Brand HANNA HI711 Total 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 Two - Insert sample into the Checker and zero it out 3.) Step Three - Remove sample and add reagent 4.) Step Four – Reinsert sample and click the button to measure your results or… - Press and hold the button for 3 seconds for a time reaction reading The HI 771 uses an adaptation of the standard methods for water and wastewater 4500Cl. FEATURES/BENEFITS: * Small palm-sized design * Accurate from ±3 ppm ± 5% of reading * Dedicated to a single parameter * Uses a single AAA battery * Auto Power Off after 10 minutes in inactivity * Built-in timer for timed reaction readings PRIMARY APPLICATIONS: * Water Quality * Education * Food Processing * Hospitality * Sanitization Order Information: The HI 771 Checker®HC is supplied with a sample cuvettes and caps (2), power reagent, battery and instructions. Checker Chlorine Meter Colorimeter Free Chlorine Meter Handheld Hanna HI771 Total Chlorine Meter à¤Ã×èͧÇÑ´¤ÅÍÃÕ¹