Duplication made easy When it comes time to duplicate a contour using just poster board, a pencil, and scissors you can go through a lot of paper before you get it right. All that hassle is eliminated with a simple contour duplication gauge. Simply press down on the contour you wish to duplicate and the gauge gives you both an internal and external duplicate shape. It just doesn’t get any easier than this. You can find these tools from Eastwood and other tool suppliers; we found them in the $10-$30 range.