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