In order to assess endface quality, manufacturers and users of singlemode fiber optic connectors use magnification to visually examine fiber optic connector endfaces. Workmanship defects such as scratches, pits, and cracks, when located in the wrong area of the endface and when severe enough, can cause high insertion loss and/or low return loss. Locations and severity of defects, as well as the degree of magnification used in inspection, must be defined to ensure consistent connector performance