Now MeasureIt v1.6 can be used to debug meshes
From version v1.6 you can view information about vertices, faces, normals and creation order. These options can be used to debug a mesh and are very useful to debug python scripts.The information is displayed in EDIT mode and OBJECT mode and can be mixed with any measure option.I know that Blender can show the vertex number in debug mode, but it's more handy to have a button for that.Download: github.com/Antonioya/blender/tree/master/measureitBlender Artist thread: blenderartists.org/forum/showthread.php