L: 30.5 W: 2.9cm H: 0.4cm
A wooden ruler. It is made of a yellow hardwood. A metal strip embedded into the wood lines the top (inch) edge of the ruler. The top edge is graduated in inches down to 1/16". The bottom edge is graduated in centimetres down to 1mm. The marks and numbers are stamped in black. A curved groove lengthwise down the middle of the ruler. A scratched inscription reads "SWTICHBOARD".