Waveguide Calibration Kits

Metrology-grade calibration kits for Vector Network Analyzers (VNAs) serve waveguide frequency bands from 18 to 220 GHz.  Each kit includes a fixed short, a matched load, and three waveguide shims. Each kit is packaged in a rugged case and includes calibration data for all industry-standard VNAs. NIST-traceable calibration standards are optional. 

 https://www.eravant.com/products/calibration-kits