Customizing MapTips for event editing
When you edit events in Production Mapping, MapTips appear to show you the measure value as you move or modify a linear or point event. By default, one significant digit is shown in a MapTip, but you can choose to display up to five.

Steps:
- Start ArcMap.
-  On the main menu, click Customize > Production > Production Properties.The Production Properties dialog box appears. 
- Click Editing on the left side of the dialog box. 
- In the Linear Referencing area, type or choose a value in the Number of significant digits in measure tip box.The default value is 1, but you can choose to display up to five significant digits. 
- Click OK.
6/14/2012