The HI96771 Ultra High Range Chlorine Portable Photometer combines accuracy and ease of use in an ergonomic, portable design. A user can accurately determine the concentration of chlorine over two ranges. The HI96771 has a 0.00 to 5.00 mg/L (ppm) free chlorine low range and a high range mode that measures chlorine up to 500 mg/L (ppm). The HI93701-0 reagents are used for the low range free chlorine measurement while the HI95771-0 are used for high range chlorine measurements. The HI96771 offers many advanced features including the exclusive CAL Check™ function used for performance verification and calibration of the meter.