Abstract: An apparatus for measuring small weight capacities of liquids comprises a vessel to be filled with the liquid; a pipe for the delivery of said liquid from said vessel; a body immersed in said liquid and supported in a substantially fixed position, within the vessel, by a lever adapted to transmit the buoyancy acting on said body to an electric transducer; an electronic shunt circuit fed by the output of said transducer; and a measuring instrument fed by the output of said electronic shunt circuit through an amplifier.