AccentPDIR (also known as Waco Instruments) is a distributor of equipment solutions for water treatment and wastewater treatment. It offers boiler and cooling towers, centrifugal and drum pumps, chlorine DO turbidity, conductivity and resistivity, flow meters, hand-held water quality meters, level controls, tanks and containment, etc. The company was formed as a result of a merger between Accent Control Systems and PD-IR Instruments.