Flow Meter, Flow Indicator, and Flow Controller are devices used to measure, indicate, and control the flow rate of fluids (liquids or gases) in various industrial and commercial applications. Each of these devices serves a specific purpose in the management of fluid flow.

Flow Meter: A flow meter is a device designed to measure the volume, mass, or velocity of fluid passing through a specific point in a system. It provides quantitative data about the rate of flow and is crucial for accurate monitoring and control of processes.

Flow Indicator: A flow indicator is a device that visually displays the presence or movement of fluid in a system. It provides a simple way to confirm that fluid is flowing and helps in diagnosing potential flow issues.

Flow Controller: A flow controller is a device used to manage and regulate the flow rate of a fluid to a desired setpoint. It actively adjusts the flow to maintain a specific flow rate, either by directly controlling the flow or by manipulating control valves or other flow-regulating devices.