The HI782 Marine Nitrate High Range Colorimeter 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 colors visually. - Measurements with a range up to 75.0ppm - Less complex laboratory grade accuracy - Requires only 1 reagent - Simple, intuitive digital operation - Compact and precise whether at home, at work, or on-the-go