The ECHO Flow Hunter III is a highly accurate Open Channel Flowmeter using the latest non-contact ultrasonic technology for measuring flow in all types of weirs and flumes. It uses the most advanced "Smart Transducer" technology to produce a narrow ECHO PULSE and prevent condensation build-up. It is easy to program and maintenance-free. It has been specifically designed to measure influent and effluent water flow from all types of municipal and industrial treatment plants to ensure regulatory compliance. It comes standard in a rugged NEMA 4X, wall-mount enclosure with a UV Protection clear lid for years of operation. 100-240 VAC Power Supply. PVDF Transducer with 4m range and 10m cable length. Primary Measuring Devices measured: WEIRS: V-notch, Rectangular, Trapezoidal, Cipolletti, FLUMES: Parshall, Palmer-Bowlus, H, HS, HL, Trapezoidal If custom, we also provide a DIY (Do It Yourself) Curve Table to input Head vs. Flow