The Aspect Ratio quality criterion for mesh elements reveals the degree of conformity of a mesh element to the regular element of its type (with all edges having the same length).
To apply the Aspect Ratio quality criterion to your mesh:
Display your mesh in the viewer.
Choose Controls > Aspect Ratio or click "Aspect Ratio" 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 an Aspect Ratio quality control operation.