HI 761 Checker®HC Handheld Colorimeter - Total Chlorine Ultra-Low Range HI 761 Checker®HC Handheld Colorimeter Total Chlorine Ultra-Low Range The HI 761 Checker®HC is a simple, accurate, and cost effective way to measure ultra-low ranges of total chlorine. Designed as a more accurate alternative to chemical test kits, the HI 761 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 761 uses an adaptation of the USEPA method 330.5. The reaction between the chlorine and DPD reagent causes a pink tint in the sample. FEATURES/BENEFITS: * Small palm-sized design * Accurate from ±5ppb ± 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 SPECIFICATION: Range 0 to 500 ppb Resolution 1 ppb Accuracy (@25°C/77°F) ±5ppb ± 5% of reading Measurement Method Colorimetric Light Source Photodiode @525 nm Light Detector Silicon photocell Method Adaptation of the USEPA method 330.5. The reaction between the chlorine and DPD reagent causes a pink tint in the sample. Power Supply Battery - 1 x 1.5V AAA Power Auto Off After 10 min. of inactivity Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Dimensions 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”) Weight 64 g (2.25 oz.) ORDERING INFORMATION: The HI761 Checker®HC is supplied with sample cuvettes with caps (2),powder reagents,battery and instructions. Chlorine Meter Hanna HI761 Total Chlorine à¤Ã×èͧÇÑ´¤ÅÍÃÕ¹