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By certification 
Sokkia Type Tribrach with Optical Plummet/ Optical Plummet Twist Focus Tribrach - Gray for GPS base stations, theodolites and total stations.
Model NO.: AJ13B3
Tribrachs accept Sokkia EDM systems,electronic and optical theodolites,as well as equipment and accessories.
Base plate has standard 5/8 x 11 threads and circular level vial with a sensitivity of 10 min./2 mm push-pull side focus.
