LUMI-Q String is an inspection system capable of detecting both electrical/material and geometric defects on solar strings. Using a laser-free and contactless method, it guarantees comprehensive defect identification and classification, even for the most complex cell structures with the smallest finger and busbar widths. LUMI-Q String integrates seamlessly into the stringer outlet without requiring additional space, making it retrofittable. With its fast measurement speed and robust data management capabilities, LUMI-Q String improves module manufacturing and ensures unparalleled module quality and efficiency.