For example: Agilent E4440A or Anritsu 68369
Bridge
Andeen-Hagerling AH 1100
AH 1100 Capacitance Standard Frame/AH 11A Fused-Silica Capacitance Standard

Manufacturer: Andeen-Hagerling
Andeen-Hagerling AH 2500A
AH 2500A: 1 kHz Automatic Capacitance Bridge

Manufacturer: Andeen-Hagerling