Hach’s Phosphax sc LR online process analyzer measures PO4-P concentrations as low as 0.015-2 mg/L with high accuracy and stability. It provides low-range orthophosphate measurements to ensure compliance and lowers plant-operating costs. It has been tested at wastewater treatment facilities in Wisconsin, which has some of the strictest regulations for phosphorus discharge in the U.S. 800-227-4224; www.hach.com