A medical device or piece of diagnostic equipment is provided with an RFID reader (= lock). In a contactless and automated process, it reads a consumable equipped with an RFID-Label (= key)—such as a medication, a sample container, or reagent vessel. The data stored on the RFID chip (product code, dose, signature, etc.) ensure that only authentic products are used. Application errors due to an expired product or wrong dosing are avoided.