Abstract: A flow-monitoring method and device for measuring the flow of fluid through a conduit such as a pipeline or open channel. More particularly, the present invention relates to a method and device for monitoring fluid flow for metering purposes. In one embodiment, the device includes a sensor system in communication with a counter system. In a further embodiment, the sensor system includes a vane moveable between an activated and a deactivated position. When fluid flows past the vane, the vane is moved into an activated position and the sensor system in turn activates the counter system for recording the length of time during which fluid is being supplied through the pipeline or channel. When fluid is no longer supplied, the vane reverts to a deactivated position which signals the sensor system to turn off the counter system.