# Length 2D

This quality control criterion consists of calculation of length of the edges combining the meshing elements (triangles and quadrangles) of your mesh.

To apply the Length 2D quality criterion to your mesh:

1. Display your mesh in the viewer.

2. Choose Controls > Length 2D or click button in the toolbar. Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:

See Also a sample TUI Script of a Length 2D quality control operation.