The Agilent 85057A is a verification kit. It has a 2.4 mm connector and covers a frequency range of 45 MHz to 50 GHz. This kit includes a 50 Ohm airline, stepped impedance airline, 20 dB and 40 dB attenuators. The verification kit is used with an Agilent 85056A 2.4 mm calibration kit and network analyzer, and including the Agilent 8510, 8719/20/22.