Each drawing window has vertical and horizontal rulers that show measurements at the scale (scale: A measure of the relationship between actual distances and distances represented in a Visio drawing. For example, a floor plan might have a scale of one meter of actual distance to one centimeter in the drawing.) of the drawing.
The intervals of the ruler correspond to the measurement unit you set in the Page Setup dialog box. The units that appear on the ruler and the location of the zero point (zero point: (1) The location of the 0 on the horizontal or vertical ruler. (2) The point in the drawing window where the zero points of each ruler intersect. By default, the zero point is the lower-left corner of the drawing page.), or starting point, for both rulers are set in the Ruler & Grid dialog box.
When you move shapes in a drawing, faint lines appear on the rulers to indicate the position of the shapes.
Note To show or hide rulers, on the View menu, click Rulers.
Ruler zero point