The invention relates to a measuring
actuator, a measuring cap, a protective cover, a measuring unit, and a device for fixed and variable measuring and discharging of fluid from a container. The
actuator being configured for detachable and movable connection to the cap and adapted for sealing off fluid when in a non-actuated state and to
discharge fluid when in an actuated state, the
actuator including at least two openings, a
discharge opening and a fluid inflow opening; the cap-including at least three openings, a
discharge opening and an actuator receiving opening and a fluid inflow opening; the measuring unit including the cap, the actuator, and a spring; the cover for protecting the measuring unit being configured for attachment to the cap and / or the measuring unit; and the measuring device including the cover, the cap, the actuator, the spring, and the container.