Global units allow each user to define the display and automatic conversion for each measurement variable.
First select the measurement variable, highlight with the mouse the row containing the desired unit and then click "Activate". The activated unit is marked by an asterisk in the first column. To change the number of digits to the right of the decimal, click "Change" and enter the number of digits. All values of this measurement variable will now be displayed in the reports with the newly selected unit and the selected number of digits to the right of the decimal.