Chances are you already need a steel ruler for your fixing and making tasks, so why not use one that can do much more than most? That’s the idea behind the ten-function Tiruler, which packs a protractor, caliper, bubble level and even a wrench.
Currently the subject of a Kickstarter campaign, the titanium-bodied folding Tiruler is made by Hong Kong company MakerPi. First and foremost, the device can indeed serve as a straight-edge ruler, for measuring, drawing or cutting straight lines.
I think think that things like this are super cool.
Not knife content though.
Read the whole thing at NewAtlas.com