Double Points April - Purchase this item and get 
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
