GDF321, Tribrach without Plummet: High accuracy, maintenance free tribrach. Individually tested. Suitable for all high angular accuracy requirements. Torsional stiffness <1″, weight 760 grams (1.72 lb). Order No: 777 508

GDF322, Tribrach with Optical Plummet: High accuracy, maintenance free tribrach. Individually tested. The optical plummet is of robust construction, virtually eliminating the need for adjustment during the lifetime of the tribrach. Torsional stiffness <1″, weight 850 grams (1.90 lb). Order No: 777 509