The help view.  To learn more about an item in this dialog, position the mouse over it.

Check this box if you want a text object to be created containing this same displayed value. The text object will be placed in the 2D output layer after you click the OK button.

The desired value is displayed here, in the units currently in use in the drawing. If you chose "Always recalculate" for the DTM, then the DTM is recalculated for this display based on the current data in the data layer.