Indeed.
Investing in a Spectrum Analyser does not stop with the purchase of the device itself!
You have to consider buying a lot of tools, too:
1) DC Blocker
2) External switchable attenuator (prices go from around 50 Euro to infinite, according to specs)
3) Cables (kind of stupid using bad cables on such an expensive device - especially if low quality cables attenuate or distort the signal you want to measure - this gets increasingly expensive, the higher the frequency)
4) Adapters: you get N-type connector, but want to measure a DUT with SMA, F, whatever connector... Get adapters!
5) The N-type connector of your spectrum analyser is not exchangeable. Wear it out and you have a problem. Best to get a connector you screw onto it, which acts as a sacrificial connector.
6) Probes: I am not into measurements and certification of electronic boards, but if you want to carry that out, you need probes.
7) Get a cover, bag, whatever to avoid your precious instrument from accumulating dust.
Signal generator
9) Noise generator
10) Power meter (wish I had one)
11) ...
Cheers,
Vitor