Rare Vintage Videoscope Vascular Analyzer MER INC (See Description)

This is an auction find. This is being sold for parts or not working, as I do not know how to properly test it. Plugged it in and it powers on great. Messed around with some of the buttons and they seem to be doing something, idk if it’s working properly though, especially considering I’m not actually hooking it up to a person. The 3 “function” buttons in the middle do not work and are not able to be pushed in. There’s a humming sound. I can’t find this piece anywhere online at all, nothing. Seems to be pretty uncommon. I am open to offers of any kind, but I’m sure this could fetch a decent price.