GDF111-1, Tribrach without Plummet: Suitable for TPS instruments with an angular accuracy of greater than 3″. The footscrews have a large diameter which permits fine adjustment even when wearing work gloves. Torsional stiffness <3″, weight 780 grams (1.72 lb). Order No: 748 888

GDF112-1, Tribrach with Optical Plummet: The tribrach and optical plummet are of robust construction and suitable for long period exposure in all environments. This makes the GDF112 ideal for GNSS and backsights and control points. Torsional stiffness <3″, weight 840 grams (1.48 lb). Order No: 798 181