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Can you share the link to the insta photo so we can see what item you're talking about?

Cool, I think it's this: https://equipboard.com/items/audioscope-third-of-octave-spectrum-analyzer-2813-e

You can get a pretty decent look at it here.

yes, that's a spectrum analyzer.... you don't see too many people using them in hardware format these days outside of mastering suites. If you sum to analog or record in analog entirely it can be a really useful tool. There's a general shape to records from certain genres that you can 'see' even on a unit with less bands.

If the OP plans on using it to check when the room he's mixing in is 'lying' to him then he can just use any old plugin, they're actually more accurate than analog units.... unless he's doing some of his work outside the box, then he'll want to find a used unit from the stone ages (read: when I was young) I used to have a Samson rack unit that was rpetty decent and didn't cost much.

If he just wants to have a cool LED visualizer for his music to entertain himself and his friends maybe? and accuracy is not an issue? There are tons of DIY explanations on how to make your own audio visualizer fromr eadily available aprts. Really, no electronics background is needed to make something like that, but understand that what these dudes are using is a precision piece of test equipment and that what you build will be a little less precise and shouldn't be sued to actually analyze the audio going into it for mixing purposes.

And frankly, unless you're pretty experienced and you can really hear the frequencies quite a bit already, name those key bands and really understand the gians tructure needed to drive loudspeakers the right way in each frequency range then being able tos ee them can do more harm than good to your mixes. I think 'seeing the music' on the a screen has done a huge disservice to music as a whole. These sorts of advanced meters are for people with a really strong electronics and acoustics background coupled to their music chops and good ears. If you don't have a firm idea how much extra power a abss frequency eneds in roder to be heard at widely varying playback levels in spaces ranging from living rooms to car itneriors to clubs? well what is the gain elvel at 80hz on a spectrum analyzer really telling you? Its in the red, tis hot, yes, but in relationship to the mix? Do you turn 80 down or turn the whole mix down? Or limit the mix?