Oce CS120 Reference Manual page 53

.
NOTE
•
Press [C] to cancel an incorrectly entered value.
•
You can enter only 2, 4, 8, or 16 as the denominator.
•
The value entered in inches is converted to mm by the copier each time it is
entered. Thus, there may be a slight difference between the value calculated and
the actual value entered.
•
To enter values in mm, press [mm].
Entering Characters from the Touch Panel Display