The 3000/3100 Series Spectrum Scope facility makes it possible to display current spectra sweeps as well as minimum, maximum, differential and various computed spectra in different colours, individually or simultaneously. A history of past sweeps is also maintained and selected sweeps can be displayed, in user-assigned colours. If you click on a peak in the spectrum sweep, you will be tuned instantly to where the cursor points. Double-clicking next to a peak causes its centre frequency to be found. Spectra can be saved and printed.