High-quality tribrach features 3X magnification and a twist focus. Its reticule is composed of two small concentric circles. With a sighting distance of 0.3 m to 15 m, accuracy of 0.5 mm per 1.5 m. A locking forced-centering knob, a 5/8 x 11 base and an 8-minute circular vial. Color: Grey.