Reagents for Freshwater Alkalinity HI 775 Checker HC ®, 25 Tests

Range 0 - 300 ppm in salt water | Colorimetric Method | Resolution 1 ppm

Range 0:00 to 2:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm

Range 0:00 to 2:50 ppm | ascorbic acid method | Resolution 0.01ppm

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.