One ruler to rule them all. This is a basic 12-inch ruler, but made from a PCB. We have included a lot of useful information on each side of the ruler that you might use daily, including Wire Gauge holes, transistor diagrams, common fractions, Roman numerals, and metric-to-imperial conversions. Most importantly, the ruler provides a straight edge with centimeter markings on one side and inch markings on the other. You'll also find a small protractor in the middle for all your angle measurement needs. While we figure you have a fairly good idea of how to use a ruler, we do have a tutorial that explains everything you'll see! https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2019-04-12 https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2022-02-21 https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2025-04-12 https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2025-04-14 https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2025-05-14 https://elecena.pl/product/15616858/sparkfun-pcb-ruler-12-inch 2025-05-17