I never thought of that. I’ve always went by eye, just looking at the model a lot from every angle. Same as you, using matcaps, placing lights, moving them around. I do use mesh checkers to check my mesh in edit mode, since an interior face or double vertices can mess things up without me noticing. But for surface imperfection and wobbles, just good old regular primate vision. Maybe someone knows of an addon or some other tool.
