ResInsight supports measurements in the 3D views. To enter measurement mode, press the ruler toolbar button
or the keyboard shortcut **Ctrl-M**. This mode can also be activated from the right-click menu in a 3D view.

When ResInsight is in measurement mode, clicking on an surface in the 3D view will set the first measurement point. Clicking on a different surface will set the second measurement point, and display a label with measurements. Additional clicking will start a new measurement between two points.

The measurement label contains the following:

**Length**- The length of the measurement segment**Horizontal Length**- The length of the measurement segment projected onto the XY plane

ResInsight also supports measuring a polyline (a set of line segments), which can be activated with the polyline ruler toolbar button
or **Ctrl-Shift-M**. The measurement label will now contain additional measurements.

The measurement label contains several lengths.

**Segment Length**- The length of the last segment**Segment Horizontal Length**- The length of the last segment projected onto the XY plane**Total Length**- The total length of the measurement polyline**Total Horizontal Length**- The total length of the measurement polyline projected onto the XY plane**Horizontal area**- The area of the polyline projected onto the XY plane

To leave measurement modes, press the toolbar button, press the **Esc** button or press the keyboard shortcut used to activate the mode again.