ABSTRACT: This is the user guide of the Maury Microwave WR229 Waveguide SSLT Calibration Kit for models WR229CK10\12 Series. The WR229CK10\12 series of waveguide SSLT calibration kits are designed to provide accurate calibrations of network analyzers in the WR229 band of 3.30 – 4.90 GHz. Each of these kits includes all the necessary SSLT calibration standards and associated hardware needed for the accurate calibration of most network analyzers.