Leica GRZ4 360 Degree Reflector is Suitable for all robotic TPS work performed with a survey pole. Rubber mountings protect the prism. Overall 3D pointing accuracy of 5.0mm. An accuracy of <2.0mm can be acheived by aiming on a side marked by a yellow arrow. ATR range of 600m (2000ft) with any Leica Robotic TPS Instrument.