https://mptestequipment.com/rf-test-equipment/rf-bridge/keysight-85020b/
Keysight 85020B 75 OHM Directional Bridge | Micro Precision Test Equipment
Keysight 85020B RF Directional Bridge, 75 Ohm, Type N connectors, DC to 3 GHz, low insertion loss, high return loss, 30 dB directivity.
precision testkeysightohmdirectionalbridge