Purpose
This dialog allows the user to select the unit of measurement system for input and calculations.
Description
The dialog shows the available unit of measurement systems:

Figure: select unit system dialog
The following data fields are available:
- 'Unit System', a list of options with Metric and Imperial for metric SI units or US costumary units.
The buttons at the bottom are:
- 'Help' button to show this help page
- 'OK' button to get the selected unit system.
- 'Cancel' button to cancel the selection.