The F-1000 is an electronic flow meter designed to measure the flow of a fluid in a pipe. The meter is factory calibrated to any engineering units and displays the rate of flow or the total of flow on a 6 digit LCD display. Two AAA batteries power the unit for up to one year. There are three models are available: F-1000-RB is a rate meter - designed to measure and display the rate of flow. F-1000-TB is a totalizer meter - designed to measure and display the total flow. F-1000-RT is a rate/totalizer meter - designed to measure and display both the rate of flow and the total flow.