The HP Agilent R11645A verification kit has a W-28 connector and covers a frequency range of 26.5 to 40 GHz. Verification kits are used to verify that a network analyzer is operating within its specified performance. All verification kits include measurement data and uncertainties which are traceable to the U.S. National Institute of Standards and Technology (NIST). This kit includes a standard waveguide section, standard waveguide mismatch, 20 dB and 50 dB attenuators.