Aluminum 12" ruler features photo-anodized calibrations in inches and centimeters on the front. Create your own list for the back. Whether it's a list of important dates in your organization's history, customer service tips, procedural steps, or any other information you would like to promote, this is a useful product that will stay on someone's desk as a constant reminder of your message. Calibrations: Inches and Metric. Also on page 15 of catalog.