You can specify that one inch on your screen equals one inch of "real" distance. You'll find this tool particularly useful if you are drawing in 1:1 Zoom mode, as it lets you work using real world distances as opposed to relative distances that depend on screen resolution.
Before you can perform this procedure, you need a clear plastic ruler for comparing real-world and on-screen distances. This ruler should use the same unit of measurement you set for the grid and rulers. For more information, see "Using the rulers and grid" on page 55.
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