Flow measurement can be performed using several different devices such as Coriolis, differential pressure, vortex, magnetic, ultrasonic, turbine and positive displacement meters.Rosemount ultrasonic flow meters offer the best accuracy in flow measurement.Rosemount Ultrasonic Gas Flow Meters offer greater accuracy, greater rangeability, advanced flow meter diagnostics, with no moving parts that virtually eliminate the pressure loss common to other types of flow measurement devices. This advanced ultrasonic measurement technology can be applied to custody transfer, allocation measurement, metering control, leak detection and inventory control applications.