Microstructured device for removably storing small quantities of liquid, wherein: - the apparatus has a first cavity with at least a first section for storing the small amount of liquid, - the first section is closed by a cover element and a blocking element, - the cover element is a membrane or foil, - the device has a carrier, - the device comprises means for transmitting a force from the cover element to the blocking element, which destroys a connection between the blocking element and the carrier or destroys the blocking element such that the quantity of liquid from the first section of the cavity is removable, - the first portion of the first cavity is formed in the carrier, - the blocking element and the carrier are connected to one another in one piece, - the cover element is indestructible when a minimum force is exerted to destroy the connection between the blocking element and the carrier or to destroy the blocking element or is destructible at least at a predetermined breaking point, characterised in that - the device in the carrier has a second cavity which is separated from the first cavity by the blocking element, - the blocking element has a first and a second end region, - the first end region has a predetermined breaking point, - in the first end region in the second cavity a shoulder is formed, - the first end region is connected in one piece to a plunger, - a latch is provided at the first end region, - the second end region forms a hinge region on which the blocking element is pivotally mounted, - the device comprises elements for holding the blocking element with which, after applying the minimum force, the blocking element can be held in a deflected position, wherein the shoulder and the blocking element interact as elements for holding the blocking element. - the apparatus has a first cavity with at least a first section for storing the small amount of liquid, - the first section is closed by a cover element and a blocking element, - the cover element is a membrane or foil, - the device has a carrier, - the device comprises means for transmitting a force from the cover element to the blocking element, which destroys a connection between the blocking element and the carrier or destroys the blocking element such that the quantity of liquid from the first section of the cavity is removable, - the first portion of the first cavity is formed in the carrier, - the blocking element and the carrier are connected to one another in one piece, - the cover element is indestructible when a minimum force is exerted to destroy the connection between the blocking element and the carrier or to destroy the blocking element or is destructible at least at a predetermined breaking point, characterised in that - the device in the carrier has a second cavity which is separated from the first cavity by the blocking element, - the blocking element has a first and a second end region, - the first end region has a predetermined breaking point, - in the first end region in the second cavity a shoulder is formed, - the first end region is connected in one piece to a plunger, - a latch is provided at the first end region, - the second end region forms a hinge region on which the blocking element is pivotally mounted, - the device comprises elements for holding the blocking element with which, after applying the minimum force, the blocking element can be held in a deflected position, wherein the shoulder and the blocking element interact as elements for holding the blocking element.