The Leica GRZ4 360 degree reflector prism is a light-weight, passive reflector suitable for all robotic TPS work performed with a survey pole.
The GRZ4 has an overall pointing accuracy of 5mm. However, when aiming directly at one of the three prisms, indicated by yellow arrows, an accuracy of better than 2mm can be achieved.
This reflector is recommended for all robotic work performed with a survey pole.