> For the complete documentation index, see [llms.txt](https://docs.sensori.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sensori.systems/viewing/measurement.md).
# Measurement
The Sensori Viewer includes tools for distance, area and volume measurement.
Click the measurement button in the viewer to start measuring 
Ctrl+click on the 3D geometry to select a point. Add a second point to define a distance measurement.
With 3 or more points, you can define an area measurement.
Ctrl+click on an existing point to delete it, or ctrl+drag to move it.
To measure a volume, first click points to define a surface. The volume will be measured between this surface and the nearest 3D geometry.
Press the enter key to calculate the volume. This might take up to half a minute to complete. If there are any holes in the geometry, this can affect the accuracy of the measurement. When the measurement has completed, coloured dots are used to indicate the included volumes on either side of the surface.
The tool can be used to calculate both cut and fill volumes.
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