The Leica GDF322 Pro Tribrach w/ Optical Plummet is the latest tribrach from Leica, and it replaces the GDF122.
This is Leica's most precise tribrach. 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".
ALL TRIBRACH LEVEL VIALS ARE CALIBRATED BEFORE THEY SHIP!