For example: Agilent E4440A or Anritsu 68369
Boonton
Boonton 4321
30MHz Programmable Calibrator Module (front output)

Category: Plug In / Part / Component / Module
Boonton 4500A-01
Boonton 4500A Dual Channel RF Peak Power Meter/ Analyzer w/ Option 01

Category: RF Power Measurement
Boonton 51011EMC
50 ohm Diode Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51012
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51013
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51015
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51033
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51072
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51075
50 ohm Diode CW Power Sensor, 500 kHz to 18.0 GHz, -70 to +20 dBm

Category: Power Sensor
Boonton 51078
50 ohm Diode CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51100
50 ohm Thermal CW Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51101
50 ohm Thermal Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51102
50 ohm Thermal Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Boonton 51200
50 ohm Thermal Power Sensor

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)