The Keysight 85059B is a 1.0 mm calibration kit designed for vector network analyzer systems operating over the frequency range of DC to 120 GHz. The opens, shorts and loads in this kit are optimized to provide accurate and traceable calibrations over the specified frequency range. The 85059B with 85059V 1 mm Verification kit are replacements for the 85059A 1 mm calibration/verification kit.