This is Mattel’s 1:1 scale prop replica of the PKE Meter from Ghostbusters.
This prop replica features light sequences from both Ghostbusters and Ghostbusters II, adjustable LED and screen animation speeds, three screen displays as seen in the films (diagonal, off, arc) and opening wings!
It also comes with a really, really cool storage crate which by itself would make an awesome collector’s display piece:
You’ll find these for about $94 on Amazon and you’ll also find it at a bit higher price from some other outlets.
However, one is available on Ebay right now with a buy it now price of only $70, and an even lower starting bid of only $50. That’s a pretty good deal given it’s a brand new prop replica that the seller says was only opened once to check that it was in perfect brand new working order.
Go here and see if you can score it at a lower than usual price: