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Scale rulers
Use these scale rulers to measure architectural plans, maps and other scaled objects.
Step 2 Set up your printer
After opening the Ruler with Adobe Reader (download it here) press on the Print button 
Use the following printer settings:
- Set Page Scaling to None
- Click Properties. Set Page Size to Letter or A4 (depending on the used paper)
Step 3 Test your ruler
Hold a blank paper against your ruler as shown on the image. Letter sized paper should measure 27,94 centimeters or 11 inch vertically. A4 sized paper should measure 29,7 centimeters or 11,6 inch vertically.