This oval gear flow meter has been specifically designed to measure the flow rates of fuels such as petrol, jet fuel and diesel in a highly accurate and repeatable manner. This flow meter achieves this through the use of a positive displacement technology that uses two oblong (oval) gears that are configured to rotate at right angles to each other within a cavity of a known volume. These two oval gears have synchronised teeth so they never get jammed up. As the fuel or diesel flows through the flow meter, the gears rotate, the faster the flow the faster the rotation. Since the volume of each rotation is known, the rotation speed of the oval gears is directly proportional to the flow of the fuel or diesel.