Specifying units You can specify the default units that will be used in the Overlay Editor. To specify units 1 Select View > Preferences. The Preferences dialog box opens. 2 Select the Units tab. 3 Specify the unit settings. 4 Click OK. Unit settings Metric Click to measure all quantities below in metric units. Horizontal position The unit for measuring horizontal positions. The default unit (1/10 inch) corresponds to the default scale of all grids (except the Millimeter Grid). Therefore, you can specify horizontal measurements according to the number of horizontal grid lines. Vertical position The unit for measuring vertical positions. The default unit (1/6 inch) corresponds to the default scale of all grids (except the Millimeter Grid). Therefore, you can specify vertical measurements according to the number of vertical grid lines. Horizontal distance The unit for measuring horizontal distances. Vertical distance The unit for measuring vertical distances. Radius The unit for measuring radius. Font size The unit for measuring font sizes. Line thickness The unit for measuring line thickness. Angle The unit for measuring angles. Show units in dialogs Select to show units after all values in object information and object setup dialog boxes.