Measure twice, drink... responsibly.
We feature a good deal of multitools here at ThinkGeek. Much like Alton Brown, we shun the unitasker (shunnnnn!). We admit, sometimes we go a little overboard, but in the case of the bottle opening ruler, we say, why not? You're in your workshop, making something. There are tools everywhere, sawdust, heavy duty adhesives. When you get thirsty, you don't want to go into the kitchen for a bottle opener.
Grab the Bottle Opening Ruler. You've just used it to measure something, now you can slide the B over the cap of the nearest bottle of brew and crack it open for some refreshment. Measure twice, drink responsibly.