Reagents for HI 770 Checker HC ®, 25 Tests

Range 0.00 - 9.99 ppm NH3-N | Nessler Method | 0.01ppm resolution

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

Reagents for HI 755 Checker HC ®, 25 Tests

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.