You need Administrator user rights for this task. Configuring units is a functionality introduced in software version 1.3.0. Defining custom units is possible from software version 1.4.0 onward. Log in to the web interface as an administrator user. Select User > Preferences . Select the unit type: Select Default metric units to use metric units in all measurement parameters. Select Default non-metric units to use non-metric units in all measurement parameters. Select Custom units to define the units for the measurement parameters one-by-one. To define the units for the measurement parameters one-by-one, select Transmitter > Custom units. Select the units from the drop-down lists for each parameter. Select Apply.