Abstract: The present invention is a system used in measuring very small quantities (i.e., a few milliliters) of liquids, preferable hyper-concentrated liquids, e.g., car wash products being delivered through a pumping station into various types of car wash equipment. The benefit is that it provides a means for measuring precisely how much product is being used at any given point in time and is fast and clean. The system includes a method and apparatus for accurately calibrating a liquid flow rate in the range of one milliliter per minute to twenty milliliters per second, preferably in the range of four to ten milliliters per minute.