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diff --git a/doc/salome/gui/SMESH/input/max_element_length_3d.rst b/doc/salome/gui/SMESH/input/max_element_length_3d.rst
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+.. _max_element_length_3d_page:
+
+*******************
+Element Diameter 3D
+*******************
+
+This quality control criterion consists in calculation of the maximal length of edges and diagonals of 3D mesh elements (tetrahedrons, pyramids, etc). For polyhedra the value is always zero. 
+
+**To apply the Element Diameter 3D quality criterion to your mesh:**
+
+#. Display your mesh in the viewer. 
+#. Choose **Controls > Volume Controls > Element Diameter 3D** or click **"Element Diameter 3D"** button in the toolbar. 
+
+	.. image:: ../images/image43.png
+		:align: center
+
+	.. centered::
+		**"Element Diameter 3D" button**
+
+	Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:
+
+	.. image:: ../images/max_element_length_3d.png
+		:align: center
+
+
+**See Also** a sample TUI Script of a :ref:`tui_max_element_length_3d` operation.  
+
+