This full-color 23 x34 laminated wall chart is a great quick reference on Geometric Dimensioning and Tolerancing in accordance with the ASME Y14.5-2018 standard. The chart includes the 12 GD&T symbols (yes 2 symbols were taken out of the Standard in 2018) 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 2 new symbols added to the 2018 Standard. You will want one of these wall charts wherever drawings are being read.