The Tolerance tab of the Dimensions dialog box lets you display a tolerance value with the text of dimension lines.
Show Tolerance
Select this check box if you want the tolerance to be displayed as part of the object's dimensions.
Tolerance Mode
Select the type of tolerance for the object. Upper - establishes a maximum measure (displays "+") Lower - establishes a minimum measure (displays "-") Both - establishes both maximum and minimum measures (displays "±")
Tolerance Measure
Enter the linear or angular values to display as the tolerance for the object.