Spectrum analysis provide in depth radio frequency interference analysis and the signal level view of the RF medium . It visualize the RF activity on 2.4ghz and 5ghz including Noise and interference sources.
It also provides the signal-level data and the impact of non-wifi device interference. spectrum analyzer is to capture a representation of the signal energy (quality of the signal, signal strength, reflections, noise and interference)in graphic format
Let me know if you have a product specific query on spectrum analysis.