Viewing Z-Values
The Show Range dialog box enables you to view all or a range of z-values in your drawing. You can display all elements or only faces (in a color of your choice) that are in a specified range of z-values.
To open the Show Range dialog box:
1. Click Hidden and then, in the Modify group, click the arrow next to 
Show.
Show.2. Click 
Range.
Range.The Items area of the Show Range dialog box enables you to select one of the following:
• Elements in Drawing
• Faces in Drawing
• Elements in Part
• Faces in Part