Units and Rulers
Screenshot of the Preferences (Units & Rulers) Screen.
Description Allows the user to set whether he wishes to see the rulers in inches or cms. Screen Load Values 1.
Unit dropdown
Shall have the below values:  
Inches Centimeters
The selected unit will be the one in which the rulers shall be shown. Note: Whenever the Screen loads, the default one shall be what the user had last selected and if not, then inches.
Developer's Blueprint For Word Processor Application Page 36 of 114