Version 4.0 of the Bolt Industries Printed Circuit Board Ruler!

Version 3.o of our 12″ PCB ruler was so popular that it sold out. Rather than re-stocking the same ruler, we made some improvements. Version 4.0 features an improved resistor color code chart, more schematic symbols, the LED series resistor formula, and lots of other handy electronics references! Available in black only.

Here’s what’s on the ruler:

Front Side

- list text hereThe Raspberry PI 3/4/5 GPIO pinout
- list text hereThe Raspberry PI Pico
-Arduino Micro
-Arduino Nano
-Teensy 4.0
-Graduations in centimeters and inches
-Half of the inch graduations are sixteenths and half are tenths.
-The tenths graduations are also numbered from 0 to 9

Back Side

-Logic gate symbols and truth tables
-Seven segment LED display lettering
-Resistor color code and common resistor size footprints
-Capacitor code and schematic symbols
-Capacitance unit conversion
-LED schematic symbol, Led series resistor formula
-Transistor schematic symbols, pin outs, and footprints
-78XX voltage regulator pin outs
-Diode schematic symbols for the most common types of diodes
-Ohm’s law
-Wire size
-PCB trace widths and ampacities