Scale Ruler The scale ruler has been sandwich printed between two pieces of plastic so that the numbers do not rub off. A transparent ruler allows you to see your project under the ruler for accurate positioning and marking. 85141:4 85151:5 8514011:4 85351:3 & 1:5 85451:4 & 1:5 83451:3 & 1:4 & 1:5 85011:3 & 1:5 85021:4 & 1:5 85031:4 & 1:8 8506 8507 8508 8500-5 8500-6 MPR30