Does it have anything to do with fraking? no, it just measures the specific gravity of liquids. More specifically from 0-32° of brix. The guy who was selling it had no idea what he was selling so I got it for $25. Nearest Atago model I can find is about $180, so I win!

It seems to made out of one piece of machined aluminum and very good optics. it reads the output in Brix instead of SG, which is a little less ideal, but I can make a cheat sheet to convert. It reads in 1° steps, so I think it will be accurate enough.