FIELD: measurement technology. SUBSTANCE: gear to certify pentaprisms includes two measurement autocollimators, adjustment table to position certified pentaprism, polyhedral reference prism with angle of 90 degrees optically coupled to each measurement autocollimator, flat mirror and rotary ring for its anchoring. Measurement autocollimators can be set at angle of 90 degrees. Rotary ring for anchoring and adjustment of flat mirror can be positioned uniaxially with adjustment table. Flat mirror is optically coupled to one measurement autocollimator. EFFECT: decreased measurement error. 3 cl, 1 dwg
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