Get one of these babies for less than the price of 2 grams!
These were sold in the 70s and 80s, and still show up on auction sites. Here's a photo of a real one.
That's even crazier, I kind of assumed you just couldn't see it without being lit up and that glass stick was some kind of stir stick.
But you're right, it's a mercury thermometer you plug in.
The price is even more wild.