ABSTRACT: This is the user guide of the Maury Microwave WR42 Waveguide TRL Calibration Kit for models WR42C30\32 Series. The WR42C30\32 series of waveguide TRL calibration kits are designed to provide accurate calibrations of network analyzers in the WR42 band of 18.0 to 26.5 GHz. Each of these kits includes all the necessary TRL calibration standards and associated hardware needed for the accurate calibration of most network analyzers. This kit can also be used for Short-Short-Load-Thru (SSLT) and Offset Load calibrations.