Abstract: An inductor or eductor that includes two or more tanks or receptacles that have different volumetric sizes and correspondingly proportional graduate scales by which different incremental volumes of fluids, dry powders, granular materials, etc. can be accurately measured therein. The outlets of the tanks or receptacles are plumbed together so that material in each can be simultaneously evacuated out and into a fluid supply line. Use of the inductor or eductor together with one-way, dry-disconnect valves provides a closed system by which materials such as agricultural chemicals can be accurately, measured, dispensed and transferred.