Gas flow meters are used for measuring the flow or quantity of a moving gas.  The basis of good flowmeter selection is a clear understanding of the requirements of the particular application. Measuring the flow of liquids is a critical need in many industrial plants. In some operations, the ability to conduct accurate flow measurements is so important that it can make the difference between making a profit and taking a loss. In other cases, inaccurate flow measurements or failure to take measurements can cause serious (or even disastrous) results.