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Double Right Angle Prism OS-D
Model No.: OS-D
Permits stepping off angles of 90 Degrees and 180 Degrees with a center lens which permits foresight viewing.
Slot in handle accommodates plumb bob cord.
Features a larger field of view, and larger foresight viewing glass.
Complete with leather belt loop case.
Measures 3 3/4" (95mm) top to bottom.