Leica GDF321 Tribrach without Plummet The Leica GDF321 Tribrach is a high-precision mounting base from the Professional 5000 Series , designed for advanced surveying applications requiring maximum stability, accuracy, and repeatable instrument positioning . Each unit is individually tested to ensure consistent performance in high-accuracy workflows. Built for demanding measurement environments, the GDF321 delivers exceptional torsional stiffness and maintenance-free operation , making it ideal for precision total station setups where long-term reliability and minimal adjustment drift are critical. Key Features • High-accuracy tribrach for advanced surveying and TPS applications • Individually tested for consistent precision performance • Maintenance-free design for reliable long-term field use • Suitable for high angular accuracy requirements • Torsional stiffness of < 1″ for superior measurement stability