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On the Design tab, in the Page Setup group, click the Page Setup Dialog Box Launcher.
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Click the Page Properties tab. In the Measurement Units list, select the units you want, and then click OK.
Change the spacing of ruler subdivisions
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To change the spacing of ruler subdivisions, on the View tab, in the Show group, click the Ruler & Grid Dialog Box Launcher. In the Subdivisions lists, select the spacing you want.
Change the position of the ruler zero point
By default, the zero point is the lower-left corner of the drawing page. Do any of the following:
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To change the position of the zero point on both rulers, hold down the CTRL key and, from the intersection of the two rulers, drag to where you want the new zero point.
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To change the position on one ruler, hold down the CTRL key and drag from the ruler.
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To return the zero point to the lower-left corner of the page, double-click the intersection of the two rulers.
What about pixels as measurement units?
For some types of drawings, you may want to change the measurement units to pixels. However, a pixel isn't a unit of measurement. A pixel is just a dot on a screen and the size of the dot varies for different screens. To simulate pixels, set the measurement units to points.
