Hanna Instrument Marine Phosphate Ultra Low Range HI774

The Hanna HI774 Marine Phosphate Ultra Low Range Checker measures phosphate directly in ppm over a 0.00–0.90 ppm range. It provides a numerical result for reef keepers who want to follow relatively small phosphate changes without comparing a vial against a printed color chart.

Each test requires a clean cuvette, a measured water sample and the matching reagent. Prepare the blank and reacted sample exactly as directed so residue, fingerprints or inconsistent timing do not become part of the reading.

Order HI774-25 when replacing the reagents. The HI774 reports phosphate; the HI736 phosphorus Checker uses a different reporting unit and reagent designation. Keep the instrument model and the unit recorded with your results so changes in testing method are not mistaken for changes in aquarium water.