FIELD: educational means. SUBSTANCE: device has case, memory element and comparison element; all units are mounted in front of light source. Moreover, device is provided with additional comparison elements and memory elements. Memory element and comparison element are made in the form of digital or letter optically transparent plates-arrays. Memory element is mounted between light source and comparison element. Plates-arrays of elements topographically and geometrically correspond one to the other. EFFECT: improved quality of checking. 5 dwg
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