Martel Electronics 320 - Manual (Page 21)

After the conversion value is entered, the name for the
new units can be entered. The name consists of 1 to 5
alphanumeric characters that are selected by entering
their decimal equivalent. Appendix A gives additional
information on this. If you do not choose to enter a
name, press the Clr key and a default name of USER
will be applied.
As an example, to set up a user defined scale for
standard atmospheres where 1 PSI = .06805
atmospheres, enter the following:
Enter .06805 and press the Enter key.
19
enter 1PSI equiv
?????
enter units name
USER ?????