A flow meter is a device used to measure the volume or mass of a gas or liquid. Flow meter are referred to by many names, such as flow gauge, flow indicator, liquid meter, flow rate sensor, etc. depending on the particular industry. However, they all measure flow. Open channels, like rivers or streams, may be measured with flow meter. Or more frequently, the most utility from a flow meter and the greatest variety of flow meter focus on measuring gasses and liquids in a pipe. Improving the precision, accuracy, and resolution of fluid measurement are the greatest benefits of the best flow meter