A solderless breadboard drawn to scale, with power rails, row letters and column numbers, plus a bench reference: 555, 7805 and 2N3904 pinouts, resistor and capacitor codes, Ohm’s law and the voltage divider.

Large draws the 830-point board at 5:1 and XXL at 6:1, adding an LM358 pinout, E12 values and SI prefixes. Medium shows a 400-point half board and Small a 170-point mini board, both at 4:1.

Available in eight colorways across Small, Medium, Large, and XXL, in DuraGlyde, AeroGlyde, and StablGlyde. Inch and centimeter rulers run around every size.