MeshChecker is a Unity Editor extension which includes a set of useful tools:

«Sizes and bounds» tool visualizes and measures volumes of a selected set of objects.

«Polygons count» shows triangles and vertices count for all meshes associated with the selected objects.

«Checker» makes it easier to temporarily apply a checker texture to desired objects to detect UV-mapping errors.

«Mesh Analysis» automatically checks meshes using different analysis rules. It also helps checking meshes manually by offering different display options and manual analysis utilities. This tool offers an API to make your own automatic analysis rules, display options and manual check utilities.