You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use it? Really? All the scales? That’s what we thought.

Less than a year ago we told you about the Tiroler, a titanium ring that's a rather clever alternative to the boring ol' tape measure. Well, its makers are back with a new take on the concept, which ...