SparkFun PCB Ruler - 12 Inch

One ruler to rule them all. This is a basic 12 inch ruler, but made from a PCB. We have included a lots of useful information on each side of the ruler that you might use on a daily basis including Wire Gauge holes, transistor diagrams, common fractions, Roman numerals, and metric to imperial conversions. Most importantly, the ruler provides you with a straight line and centimeter markings one side and inch markings on the other side.

You'll also find a small protractor in the middle for all your angle measurement needs. While we figured you have a fairly good idea how to use a ruler we do have a tutorial to explain all the information you'll see!

  • 12 inch PCB ruler with markings down to 0.05" or 1/32"
  • 30.48 cm PCB ruler with markings down to 0.1mm
  • Electrical Equations such as Ohm's Law and Parallel Resistors
  • Keyboard Alt Codes
  • Color Wavelengths
  • Protractor
  • Metric Prefix Summary Chart
  • Metric conversions
  • Morse Code
  • Transistor Diagrams
  • Roman Numerals
  • Fraction Summary
  • Wire Guage Chart
  • Tap and Drill Chart
  • Size: 12"x 1.5"

SparkFun PCB Ruler - 12 Inch Product Help and Resources

How to Use a Ruler

April 11, 2019

Showing off some of the features of the SparkFun Ruler.


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Madbodger / about 5 years ago / 1

    To type π is easy: option-P. I would have used exponents for the prefixes, so instead of 10^-6, it would read 10⁶. I probably would have made the old "pie chart" style representation of Ohm's law, and maybe added "Eli the Ice man", and perhaps the EIA-96 SMD resistor code multipliers (C is 100, X or S is 0.1, etc.)

    • M-Short / about 5 years ago / 1

      I did consider doing 10<sup>-6</sup> instead of 10^6. I agree it is generally easier to use I didn't want to make the exponent too small on the ruler since that is the number you actually want to see. I actually don't think I've ever heard of ELI the ICE man, not sure how I missed it. I'll definitely consider the others if we do a revision though.

  • Member #134773 / about 5 years ago / 1

    Although I like the idea of this ruler, and will likely include one in my next order, it has the same problem as Adafruit's six inch PCB ruler that I've had for over 5 years: I'd really like to see a series of various sizes of PTH through holes so I can quickly test leads to guage what size drill I should call out to fit that particular part when I'm designing a PCB. If you decide to "respin" this one, please add that!

    • M-Short / about 5 years ago / 1

      Hmm, I have drill sizes and wire gauge, but not that, I'll definitely consider that for a 'respin'.

    • BerenV / about 5 years ago / 1

      +1 to that

Customer Reviews

5 out of 5

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Very useful Ruler!

Perfect desktop additional for hobbyists and engineers. Tons of useful reference information, all in one place. Would make a great gift for any of us nerds!

Good product idea, Sparkfun. Keep thinking outside the box. 😁