A flowmeter is a device used in the oil and gas industry to measure the flow rate of fluids, such as oil, gas or water. Flow meters are used in various stages of the oil and gas production process, including exploration, production and transportation. They can be used to measure the flow rate of fluids in pipelines, wellheads and storage tanks. The type of flowmeter used depends on the specific application and the properties of the fluid being measured, such as viscosity, density and temperature.