In your web console, navigate to the main menu item 'Settings', and then to the drop down menu item 'Units of Measure'.
On this page you'll see a list of currently available units of measure.
Navigate to "Create" in the title bar, and this will bring up a new dialogue box for you to create your new unit.
Enter an abbreviated code for your new unit of measure. This will be shown in your reports.
Enter a name for your new unit of measure. This will be shown on your terminals.