Optical tribrach’s have been accepted for their quality and durability by surveyors who demand the best. The tribrach feature specially designed optical system allows for quick and accurate checking & adjustment of the optical line of sight. It is recommended for accurate plumbing of Total Stations, GPS Systems, reflector systems & other accessories. This tribrach features a twist-focus 2.5X mag. And leveling screws with center line. It has an 10-min vial, 3-prong forced centering and a 5/8 x 11 base. Will work with most survey instruments and accessories manufactures such as: Sokkia, Topcon, Trimble, Nikon, Leica, Pentax, Seco, CST, Omni, Etc. THIS TRIBRACH HAS BEEN COMPLETELY SERVICED AND CALIBRATED FOR THIS SALE, IN EXCELLENT CONDITION. All items are packed to the requirements of the carrier.