Calibration Standard HI 721 Checker HC ®

The HI 775 Checker®HC is a simple, accurate, and cost effective way to measure alkalinity. Designed as a more accurate alternative to chemical test kits, the HI 775 provides quick, accurate results in four easy steps.

Range 0 - 500 PCU | Platinum Cobalt method | Resolution 5 PCU

Range 0-999 ppb | ASTM Method D1687-92 diphenylcarbonate | Resolution 1 ppb

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