Flow Rotameter is a dependable, simple, and low-cost flow measurement device. As a result, this instrument is used to determine the flow rate of a liquid or gas. This metre has a tapered tube that runs through a moving internal float. As a result, it is typically used in high-pressure applications. Flow Rotameter is highly useful in measuring opaque, aggressive, and non-conductive liquids in petrochemical, chemical, and pharmaceutical industries using high-pressure applications. The term gravity in gravity flow meters denotes that the rotameter must be mounted vertically.