For example: Agilent E4440A or Anritsu 68369
Keysight / Agilent Calibration Kit
Keysight / Agilent 85058B
Standard Mechanical Calibration Kit, DC to 67 GHz, 1.85 mm
Manufacturer: Keysight / Agilent
Keysight / Agilent 85058E
Economy Mechanical Calibration Kit, DC to 67 GHz, 1.85 mm
Manufacturer: Keysight / Agilent
Keysight / Agilent 85093-60010
NFTS RF module with both connectors female
Manufacturer: Keysight / Agilent
Keysight / Agilent 85097B
RF Electronic Calibration (ECal) VNA Interface Kit (for use with 8753 and 8720 series network analyzers)
Manufacturer: Keysight / Agilent
Keysight / Agilent 85519A
4-in-1 OSLT Mechanical Calibration Kit, DC to 18 GHz, Type-N (f) 50 ohm
Manufacturer: Keysight / Agilent
Keysight / Agilent 85520A
4-in-1 OSLT Mechanical Calibration Kit, DC to 26.5 GHz, Type-3.5 mm (m) 50 ohm
Manufacturer: Keysight / Agilent