Mechanical flow meters are devices used to measure the flow rate of liquids or gases in a system. They operate based on mechanical principles, often using moving parts like gears or rotors that rotate as fluid passes through. The speed of this movement correlates with the flow rate, allowing for accurate measurement. These meters are commonly used in various industries, including water treatment, oil and gas, and chemical processing. They are valued for their simplicity, reliability, and low maintenance requirements, making them suitable for many applications where precise flow measurement is essential.