Disclosed is a system and method of dispensing a selected volume of liquid. The system includes an apparatus that has a reservoir having an inlet tube and outlet tube coupled thereto, and a controller for controlling at least a portion of the apparatus. Two level sensors are positioned along the reservoir and are in communication with and controlled by the controller. The method includes steps for measuring a time a liquid level in the reservoir falls from an upper level to a lower level to calculate a flow rate. The calculation flow rate may then be used to determine and compare a dispensed volume versus the selected volume. Dispensing may then continue until the selected volume has been dispensed.