Ok, this has been hanging around long enough. So here's the answer: Nobody gets points except me
http://www.popularwoodworking.com/artic ... he-libellaPerhaps you have seen some of these in high-end tool catalogs, and have wondered what they are. The plumb level – also called a libella – was once a standard piece of equipment for the woodworker, carpenter and surveyor. In fact, a basic set of tools would always require this tool that could do so much. It can determine plumb and level, act as a square and even as a ruler if needed. The modern toolbox would need three tools to replace it: a spirit level, a plumb bob and a framing square. While the three modern tools excel in their individual tasks, the libella can still stand on its own as a jack-of-all-trades. It also has a great history behind it.