Leica GRZ4 360° Prism The Leica GRZ4 is a high-precision 360° prism designed for robotic total station surveying, delivering reliable ATR tracking, stable prism positioning, and accurate robotic measurement performance on survey poles and field setups. Its optimized geometry supports high-accuracy robotic tracking across long distances. Key Features • 360° prism for robotic total station workflows • Overall 3D pointing accuracy of 5.0 mm • Yellow-arrow orientation provides better than 2.0 mm accuracy • ATR range up to 1,000 m • Designed for survey pole mounting and robotic TPS operation