A fluid dose-measuring device adapted to be releasably received in a dispensing apparatus having an electromagnetic coil includes a housing with an outlet passage and a connector part defining an inlet passage, the housing forming an internal chamber which is in fluid communication with the inlet passage and the outlet passage, and the connector part being connectable to a fluid container; a piston moveably arranged in the chamber of the housing for reciprocating motion between a closed position in which a flow from the inlet passage to the outlet passage is prevented and an open position in which a flow from the inlet passage to the outlet passage is allowed, the piston comprising a ferromagnetic actuation part for electromagnetic actuation of the piston by the electromagnetic coil, where the actuation part is arranged in an outer body.