Measurement Cells 

MDM allows you to associate a physical dimension with a measurement field or numeric attribute, and then to assign to every numeric value a unit of measure chosen from the list of units applicable to that dimension. For such a field or attribute, the cell in the Record Detail tab has two parts that are edited separately (figure below).

The left part contains the numeric value and accepts typed numeric data entry. The right part contains the associated unit of measure (such as horsepower or millimeters), and allows you to select from a drop-down list of units of measure applicable to the particular physical dimension. You can use Tab and Shift + Tab and the left and right arrow keys to move between the two parts of a measurement cell.

Measurement cells make it easy to enforce data integrity, since units of measure must be selected from a predefined list of units rather than typed in by the user as a text string.