Hanna Marine HR Nitrate Pocket Checker - HI-782The HI 782 Marine Nitrate High Range Colourimeter is specifically designed to quickly and accurately determine high levels of nitrate for saltwater aquariums and marine applications. With a digital read out, there is no more struggling to determine colours visually. Measurements with a range up to 75. 0ppm Less complex laboratory grade accuracy Requires only 1 reagent Simple, intuitive operation (single button) Compact and precise whether at home, at