Calibration Standard HI 739 Checker HC ®

Range 0.0 - 30.0 ppm | amino acid method | Resolution 0.1ppm

Range 0.0 - 99.9 ppm NH3-N | Nessler Method | 0.1ppm resolution

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.

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.