Calibration Standard HI 715 Checker HC ®

Range 0:00 to 7:00 g / L | Photometric Method | Resolution 0.01g / L

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

Range 0:00 to 5:00 ppm | EPA Method 315 B | 0.01ppm resolution

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.