The instrument for measuring the length between two points in millimeters is accessible from the button (7) and selecting a line from the list. The measurement is done manually. They are marked with the mouse at the two points between which it is necessary to make the measurement. It is possible to move any of the endpoints. The measurement result is recalculated in real time.
When a line is selected, it’s colour turns from green to red (yellow when it’s hovered). A line can be moved and deleted by pressing Delete button on the keyboard.