Flow Meter Verification Flowhire offers various sizes of portable clamp-on ultrasonic flow meters available for offshore flow meter verification and instrument calibration. They are designed to provide accurate flow measurement for the oil and gas, offshore and pipeline industries. Ultrasonic flow meters use transducers to transmit and/or receive ultrasonic waves in the process of pipe flow measurements. As such they are non-invasive and offer a number of excellent benefits for many applications. As they can detect in-situ flow rates from outside the pipework there is no interruption to the flow or process, which means there is no downtime or disruption during installation or operation. Flowhire’s portable clamp-on ultrasonic flow meters can be pre-configured before dispatch for ease of installation and use.