Which equipment is primarily used to measure water flow?

The flow meter is specifically designed to measure the rate of water flow within a system. It provides accurate readings of the volume of water that passes through a certain point over a given time frame. This device is essential in water management and distribution systems, as it helps in monitoring water usage, ensuring efficient operation, and preventing leaks.

While other instruments might be involved in assessing different parameters of water systems, they do not fulfill the primary function of measuring flow. A water gauge typically indicates levels rather than flow rates, a pressure transducer measures the pressure of water which can indirectly relate to flow under specific conditions but does not measure flow directly, and a level sensor monitors the height of water in tanks or reservoirs without providing a flow rate reading. Thus, the flow meter is the most appropriate equipment for the task of measuring water flow.