Penco Wooden Metric Ruler
300mm (30cm) and 150mm metric rulers made out of hard and smooth beech wood that is also used for furniture and other purposes. Designed in Japan and produced in Taiwan, these rulers have a nostalgic design conscious of the old novelty of United States sundry goods. Lightweight, even, and comfortable to use.
With conversion charts on the back, this is your best way to convert Imperial to Metric without resorting to a screen.
300mm rulers display both in millimeter and centimeter, and have conversion chart and simple protractor on back.
150mm ruler displays millimeter and back-side conversion chart only.