Along the top and left (X and Y) edges of the Work Window are the Rulers, calibrated in pixels. (See Work Window.) As you move your mouse pointer around the Work Window, note that its position is tracked on both the X and Y Rulers. You can use this feature to help you position objects in precise locations on your page.
You may also click at any increment along a Ruler to set a tab stop at that precise pixel position. You can click and drag a tab stop to move it to another position on the Ruler, or you may drag it off the Ruler entirely to remove it. Each Ruler may contain up to 32 tab stops. (For more information, see Tab Guides.)
You can toggle the Rulers off or on by selecting View>Ruler.