Calibration Kit for 8720, .045 to 26.5 GHz, 3.5 mm. The Keysight (formerly Agilent) 85052B mechanical calibration kit contains precision standard devices to characterize the systematic errors of the Keysight (formerly Agilent) 8720 series or 8510C network analyzer system in the 3.5 mm interface. Calibration standards to perform full two-port calibration. Torque wrenches for properly connecting standards. Adapters to change the sex of the test port. Standard definitions on disk for loading into network analyzer.