360 Degree Surveying Reflective Prism Robotic Reflector MPR122 Replacement Compatible with Leica Swiss Style ATR Total Station. The MPR122 replacement 360° Prism with a 5/8? Thread has a high accuracy of (+/-2mm). Compared with other mini prisms, the 1.96/ 50mm (Glass Height) prism enables the total station to locate it at longer distances Copper Coated film, Prism Offset/ Constant: +28.1mm, Centering Accuracy: +/- 2mm. Connector: 5/8″x 11 Male Thread, 5/8″x 11 Female Thread. 3 Arc Second Beam Deviation. Prism Holder/ Adapter: Lift The Prism Height To 3.38/86mm.