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Apparatus is provided for measuring volumetric or mass flow of fluid which includes a capsule (12) adapted to reciprocate within a housing (22) and receive fluid from a tube (18), a magnetic force exerting device (24) adapted to exert a force on the capsule (12) that is proportional to the capsule (12) position. A seal (20) is provided in the bottom opening of the capsule (12) for fluidly blocking while a pin (36) is provided to push open the seal (20) when the capsule (12) is downwardly positioned to drain it. The volume or mass flow of the fluid can thus be measured continuously and volumetric flow determined.