# 5.2. Using Rulers

Along the left and top edges of the Document area, are a horizontal and a vertical ruler.

These rulers measure from the top right edge of the page.

Each ruler has a bright area surrounded by a dark area. The bright area shows the size and location of the currently selected frame on that page. As you change windows, the bright area changes to reflect the new frame's settings.

The ruler can measure the page in 3 units of measure:

1. Milimeters (mm) - This is the default

2. Points (pt)

3. Inches (in)

To change the units of the ruler, place the mouse cursor over one of the rulers (either one), and click with the right button on your mouse.

Select your choice from the submenu. You will notice both rulers change to the new unit of measure.

You may also notice two verticle arrows (one pointed up, the other pointed down), on the right side of the bright area of the ruler. These are used to adjust the margin of a paragraph. For more information, see the section entitled Formatting Paragraphs.

Finally, you may see some black marks, which are not part of the ruler. They may appear as "L" shaped, a "Reverse-L", an Upside-down "T", or an Upside-down "T" with a dot in it. These are location of tab stops. For more information see the section entitledUsing Tab Stops.