HP Agilent 8564EC Spectrum Analyzer 10 Hz-40GHz Opt6,7(1,5,8,data Avail) Cald!Comes with options 6 10 hz freq extension , 7 the fast zero span sweeps and for an additional fee we can add all the other options as well, including data with your already free nist calibration. You can see the unit performs beautifully with a brilliant rythm sbtx tower in there that after alignment proves to be super flat with no ripple which is really common on these 40 and 50 ghz models. Every aspect of this machine is refurbished and the case is