Calibration Standard HI 706 Checker HC ®

Range 0.0 - 8.0 ppm | DPD method | Resolution 0.1ppm

Range 0 - 150 ppm | ferrous sulfate method | Resolution 1ppm

Range 0 - 200 ppb | ascorbic acid method | Resolution 1 ppb

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.