A venturi meter is also called a venturi flowmeter. It is used to calculate the velocity of fluids in running through a pipeline.The fluid may be a liquid or a gas. The meter consists of a pipe with a narrowing throat that expands back to it's original diameter on the other side of the choke point.ound This Helpful. A venturi meter is also called a venturi flowmeter. It is used to calculate the velocity of fluids in running through a pipeline. The fluid may be a liquid or a gas. The meter consists of a pipe with a narrowing throat that expands back to it's original diameter on the other side of the choke point.