A custom Cryostation 200 PT probe station. A linear positioner with a rotator kit (+/- 183 deg) holds a 4in. wafer mount. Surrounding the wafer mount are 4 closed loop Rook nanopositioners (10mm full ROM to center, +/- 5mm side to side movement), equipped with modular probing arrays. In this configuration the whole 4 inch wafer can be probed. Probes can be output to a Quad RF or fiber feed thoughts. System can be further customized based upon customer specific requirements.