For example: Agilent E4440A or Anritsu 68369
Spectrum Analyzers
Rohde and Schwarz FSQ40
RF Spectrum Analyzer and Signal Analzer 20Hz to 40 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSQ8
RF Spectrum Analyzer and Signal Analyzer 20 Hz - 8 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSUP26
Rohde & Schwarz FSUP26 Signal Source Analyzer
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSV13
Spectrum and Signal Analyzer, 9 KHz to 13.6 GHz (20 Hz Optional)
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSV3
Spectrum and Signal Analyzer, 9 KHz to 3.6 GHz (20 Hz Optional)
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSV30
Spectrum and Signal Analyzer, 9 KHz to 30 GHz (20 Hz Optional)
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSV40
Spectrum and Signal Analyzer, 9 KHz to 40 GHz (20 Hz Optional)
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSV7
Spectrum and Signal Analyzer, 9 KHz to 7 GHz (20 Hz Optional)
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSW13
Signal and Spectrum Analyzer, 2 Hz to 13.6 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSW26
Signal and Spectrum Analyzer, 2 Hz to 26.5 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSW43
Signal and Spectrum Analyzer, 2 Hz to 43.5 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSW50
Signal and Spectrum Analyzer, 2 Hz to 50 GHz
Manufacturer: Rohde and Schwarz
Rohde and Schwarz FSW67
Signal and Spectrum Analyzer, 2 Hz to 67 GHz
Manufacturer: Rohde and Schwarz
Tektronix H500
9 KHz - 6.2 GHz Real Time Spectrum Analyzer for signal interference analysis
Manufacturer: Tektronix
Spectran HF-2025E
AARONIA AG Spectran HF-2025E Portable RF Spectrum Analyzer 1 GHz to 2GHz
Manufacturer: Spectran
Keysight / Agilent L4610A
PRM-34B Handheld Radio Test Set for Tactical Radios
Manufacturer: Keysight / Agilent