This article applies to all Ralston Field Gauge LC20 and Process Meter LC30 models.


Press and Hold the Menu/Up-Arrow Button.


Press the Backlight/Right-Arrow Button to scroll to UNITS


Press the Zero/Check Mark Button to enter the Units submenu.

The checkmark indicates the current units the Field Gauge/Process Meter is set to display. 

If you do not wish to change engineering units, press the Menu/Up Arrow Button twice to return to the main pressure screen.


Scroll to your desired engineering unit using the right and left buttons.


Press the Zero/Check Mark Button to set the new unit.