Chlorination is the most common water disinfectant. Monitoring chlorination is critical in applications such as pools and spas, fruit and vegetable disinfection, and drinking water disinfection. By monitoring this critical parameter, serious health and safety risks can be prevented. The portable HANNA HI 711 and HI 701 Checker®HC analyzers bridge the gap between simple chemical test kits and professional instruments. Chemical test kits are not very accurate and provide only 5 to 10 analysis points, while professional instruments can cost hundreds of dollars and the calibration and maintenance process can be time-consuming. The HANNA HI 711 and HI 701 Checker®HC analyzers are accurate and economical.

These portable Checker®HC colorimeters offer 0.01 ppm resolution (250 points for free chlorine, 350 for total chlorine) and an accuracy of ±3% of the reading ±0.03 ppm (mg/L). They also use an EPA-approved DPD method.

Their design allows them to fit perfectly in the palm and pocket, while the large LCD screen is easy to read. The automatic shut-off ensures that the battery life will not be drained if the device is forgotten to be turned off. The HI 711 and HI 701 Checker®HC are extremely easy to use. First, zero the device with your water sample. Then, add the reagent. Finally, place the vial in the Checker®HC, press the button, and read the results. It’s that simple.