The SECO Mini Prism 6405-12-FOR features a copper-coated prism with a nodal 0/-17.5 millimeter offset, which is usually associated with short distance measurements. White site cones are on both sides to improve vertical angle pointing or help centering crosshairs from survey instruments. In addition, these site cones work as lock knobs for the tilting-axis. A 40-minute leveling vial can be found in front and at the top of this mini prism and it is adjusted easily. This mini prism in its fluorescent orange aluminum housing maximizes survey professionals' vision in all lighting contitions, has a 5/8 x 11-inch thread on the top and bottom, and comes with a carrying bag.