GRZ4 is  suitable for all robotic TPS applications. Strong metal core with rubber bumpers  and protective end caps on top and bottom. 3D pointing accuracy of 5.0 mm. When  pointing to a side marked by yellow arrow, accuracy of less than 2.0 mm is  achieved. ATR range of 600m (2000 ft.).

 GRZ4 reflector  is recommended for all robotic work performed with a survey pole. The rubber  mountings on the top and bottom of the prisms provide protection of the glass if  the pole falls over. The reflector is supplied in a padded case for safe  transportation.

It has an overall pointing accuracy of 5mm (<1/4"). However, when aiming  directly at one of the three prisms, indicated by yellow arrows, an accuracy of  better than 2mm (<1/8") can be achieved.