The Omni Jr. is designed to meet the needs of close-in surveying work with a systems concept for maximum efficiency. The system includes: a 1" prism with cover, tiltable holder, plumb adapter, plumb line holder and carrying case. The prism can measure approximately 800' to 1,500' to either the tiltable holder or the plumb line holder. It also measures inside and outside corners. The tiltable holder allows the prism to be used in either a zero or a -30 mm offset and rotate 360¡ (only in the -30 mm position). It has a built-in target area, level vial and 5/8"-11 threads to fit prism poles and the Plumb Adapter. The plumb line holder allows the prism to hang from a Gammon reelª or plumb bob string.