Endface inspection focuses on the visible quality of the polished fiber surface and surrounding ferrule area. You use a fiber microscope or automated inspection scope to check for contamination, pits, chips, cracks, and scratches. For structured and repeatable assessment, you follow the criteria. Here are three tests that truly matter when judging fiber optic quality. It might sound technical, but the impact is huge. Three key areas are inspected in. Below, we detail the key inspection items for fiber optic patch cords, emphasizing appearance, diameter, end-face quality, and functional tests, including insertion loss and interferometer testing, in accordance with an Acceptable Quality Level (AQL) of 1.