The next time you need to map out a floor plan or draw up some blueprints for a building project, reach for Mr. Pen's triangular architect scale ruler, which displays six different scales that help you take large measurements and translate them into a smaller size for the page.

This video from the company nicely explains what I'm talking about:

The ruler is made from solid high-impact aluminum with laser-cut markings, so both the tool itself and the measurements on it should last forever. The three main sides each sport a color-coded groove so you can easily re-find the particular scale you need to work at, whether it's ¼ scale, ⅜ scale, 3/16 scale, or otherwise.

Get this useful aluminum ruler for $8 on Amazon.