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By certification 
Sokkia 724812 style Rear Screw Lock Premier Prism Assembly/ Front Locking 62 mm Premier Prism Assembly
Model NO.: AKZ19-2
This prism assembly allows the user to quickly adjust the tilting target from behind the prism as it is pointing at the instrument to allow accurate sighting.
The targets are 6x9 in.
The prism can be either mounted in a 0 or -30mm offset position.
Come with a protective carry case for the target or complete system.
Effective diameter: 64mm.
