Abstract: A fluid metering and measuring device is provided and which is particularly adapted to regulate ratios of oil and gasoline in a mixture of oil and gasoline used, for example, in a two-stroke engine. The device has a filling chamber with a fluid inlet and a fluid outlet. One-way check valves are disposed in both the fluid inlet and the fluid outlet to prevent backflow. A plunger stem comprising a piston disposed within the chamber. When the stem and attached piston are pulled upwardly, a vacuum is created in the chamber to cause a fluid, e.g. oil to flow into chamber and when depressed causes outflow. Gradations or indicia indicate the amount of oil drawn into the chamber to ensure proper fluid ratios. The metering device may be incorporated into any suitable container including a two compartment container wherein the compartments are in fluid communication.