Double Right Angle Prism Os-d
Double Right Angle Prism OS-DModel No.: OS-DPermits 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.