The Options dialog box offers several preferences that apply to interactive measurement functions.
Opening the dialog box
There are several ways in which you can open the dialog box:
1.Click the Measurement Options 
button located either in the Measurement tool window or toolbar.
2.Use the Tools > Options... menu command.
In the tree view, you can find the Measurement entry and, under it, the options that are listed in the following.
Measurement options
See also
3936 22042013