This full-color 23 x34 laminated wallchart is a great quick reference on Geometric Dimensioning and Tolerancing in accordance with the ASME Y14.5-2009 standard. The chart includes the 14 GD&T symbols and an explanation of their meaning, what they control, translations of the tolerances in plain English and the modifiers that are allowed. In addition, there are full-color illustrations of how the tolerances appear on drawings, the tolerance zones and sample verification methods. Included are the 7 new symbols and an explanation of the customized datum reference frame methodology. The major rules are restated in clear, everyday language. You will want one of these wallcharts wherever drawings are being read.