Adding the prefix "La" to anything construction is a bit unexpected, but in this case, it's a play on a guy's name, so it passes the test. The guy in question is Robert LaGesse and he's the inventor of the LaSquare. What's cool about the LaSquare...well, it's a combo square with a 2" wide foot on it.
Why is this interesting and worth a mention? Have you ever used a combo square to mark a metal stud, a piece of tubing, or a pipe? With the traditional tool, there's not enough flat edge to wrap the curve, but with the LaSquare's extended foot, the task becomes much easier.
Check out the video if you're not sure about what we're talking about...
Looks like the pricing is anywhere from $30 to $90 depending on the make and length of the ruler.