The invention relates to measurement technology, more specifically to, controlling reproduction and transmission optical density, and can be used for of metrological provision of (testing/calibration/development/testing) facilities for measurement of optical density, and also devices, used during control of objects nuclear power, enterprises oil and gas industry, railway transport, metallurgy, mashinostroeniya, medicine and others. The proposed calibration device has X-ray film with round tainted calibration sections of different optical density. Specified sections are surrounded by transparent field, on which marked perpendicular axis of symmetry of said, and is made mirror asymmetric marking. This utility model allows to increase accuracy of transmission and reproduction optical density. 5 3. U. 2 - cl; 4 dwg.