A flow meter is a device used to measure the rate or amount of fluid (liquid, gas, or steam) flowing through a pipe or channel. It helps monitor, control, and manage processes in many fields such as water supply, industry, medicine, and environmental studies.

Key points:

• Measures flow rate (e.g., liters per minute) or total volume.

• Works using different principles like mechanical movement, pressure difference, electromagnetic fields, or sound waves.

• Common types include mechanical, electromagnetic, ultrasonic, turbine, and mass flow meters.

• Used for efficiency, safety, billing, and process control.

In short, a flow meter ensures accurate tracking of how much fluid is moving through a system.