The Casio CRW-001-1JR is a smart ring that not only looks like one of Casio's digital timepieces. It works like one, too.

The watches' calculator function can add, subtract, multiply, and divide up to eight digits. As for watch functions, you get ...

While we're talking about cult classic watches, the Casio Calculator watch deserves a mention. Perhaps best known from its ...

Does it work? Don’t know about this watch, but this was done to another classic Casio watch and tested to 1200 psi. That’s a kilometer underwater, and the watch still worked afterward.