Ghostbusters is probably at the tipiity top of my list favorite movies of all time, I grew up on it, as as I got older, it got even funnier as the "adult" jokes I finally understood. The "shock box" is from not the first scene of the movie in the library, but its the second scene, where we are introduced to Bill Murray's Character, Dr. Peter Venkman. And in this scene they are testing the ability of ESP and negative reinforcement. I've always loved the "shock box", and found out that it was a Beckman pH Meter Model G, and you can buy them on ebay. So, this is me showing mine off, along with the mods I made to it.
I got the flask idea from a video I had previously seen on YouTube, most likely by Punsished Props I think if not, then I am not sure where. So, if you know who else did that little "mod" to this project, please let us know in the comments so I can give proper credit where it is due!