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This ASME Y14.5M-1994, 2009 2018 comparator highlights the differences between the three Standards. The reference is packed with useful information. Each of the 14 geometric symbols (from 1994 and 2009) are shown with their corresponding meaning, illustrations of sample tolerance zones and inspections. The 7 new symbols from 2009 and 2 new symbols from 2018 are shown with the meaning from the corresponding Standard. Included is a description of how it was done in previous standards without the new symbol. A graphic illustrating how to use the new symbol is included. If you are moving from the 1994 Standard to the 2009 Standard or from the 1994 or 2009 to the 2018 Standard or if your company has drawings in accordance with both standards, this handy reference is a MUST HAVE.