Abstract: A system for displaying a units categorized value corresponding to the cumulative amount of fluid dispensed from a delivery system having a hand-held nozzle with a trigger actuable by an operator to admit fluid through the nozzle. A display is mounted upon an enclosure to be responsive to a control signal for displaying visually perceptible indicia in selected increments corresponding to the units categorized value. A processor is provided within the enclosure for deriving the control signal. The processor is responsive in a calibration mode to the actuation of the trigger of the hand-held nozzle to derive a calibration count value corresponding to the time elapsed in dispensing a predetermined unit amount of fluid. When this trigger is actuated, a flow monitor at a fluid tank source detects the flow of fluid and broadcasts the presence of the fluid flow condition to a receiver mounted at the enclosure.