iFixit Metal-ruler - 15 cm
Measure, calculate, design, and show off your fixers’ pride.- sturdy six inch (15 cm) ruler includes a pocket clip that doubles as a sliding measurement stop.- toss it in your shirt pocket or tool roll—you’ll be surprised how often you use it to measure, align, and sketch on the job.- reference table to convert fractional inches to decimal and millimeters.- steel construction means it's up to light scraping and prying in a pinch.