The DOF6000 series DOF6000-P Portable Open Channel Ultrasonic Flow Meter consists of Flow calculator and the Ultraflow QSD 6537 Sensor. The Ultraflow QSD 6537 Sensor DOF6000-P Portable Open Channel Ultrasonic Flow Meter is used to measure water velocity, depth, and conductivity of water flowing in rivers, streams, open channels and pipes. When used with a companion Lanry DOF6000 Calculator, flow rate and total flow can also be calculated. The flow calculator can calculate the cross-sectional area of partially filled pipe, open channel stream or river, for stream or river, with up to 20 coordinate points describing the riverâ??s shape of cross section. It is suitable for various applications.