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The State Primary Standard of the optical density unit GET 206-2016 is considered. The operation principle of the standard based on filtering the luminous flux of transmitted and reflected light is described. The composition of GET 206-2016 and its metrological characteristics are presented. Data on the study of the geometric and spectral characteristics of the standard are presented. Currently, GET 206-2016 allows solving the problems of metrological support of optical transmittance density measuring instruments (radiographic non-destructive quality control of materials in various industries) and optical reflection density measuring instruments (printing, applications of energy-saving and graphic technologies).