ABSTRACT: This is the user guide of the Maury Microwave 1.85mm Coaxial Calibration Kit for models 7850CK30/31. This series of 1.85mm the DC to 67.0 GHz coaxial calibration kits is designed to provide accurate calibrations of network analyzers in range. Each of these kits includes all the necessary calibration standards and associated hardware needed for the accurate calibration of most network analyzers.