Reagents for HI 749 Checker HC ®, 25 Tests

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

Range 0:00 to 3:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm

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

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.