====== Mouse ruler tool ====== The //mouse ruler// tool allows you to measure the distance between two points, as well as the difference in elevation. To activate the mouse ruler tool, select '//Tools->Ruler//' in the menu, or click on the toolbar icon shown below:
| {{:l3dt:userguide:tools:ruler:rulericon.png|:l3dt:userguide:tools:ruler:rulericon.png}} ^ The mouse ruler tool icon. ^
To use the ruler, left-click on the start point and drag the mouse to the end point. {{ :l3dt:userguide:tools:ruler:ruler1.png?400 |:l3dt:userguide:tools:ruler:ruler1.png}} When you release the left mouse button, a window will pop-up to display the start/end coordinates, the horizontal distance (in kilometres), the vertical difference (in metres), and the average gradient (in degrees), as shown below: {{ :l3dt:userguide:tools:ruler:ruler2.png?400 |:l3dt:userguide:tools:ruler:ruler2.png}}