In-process Inspection: Sampling inspection is conducted on semi-finished products and partially completed finished goods midway through the production process. The inspection covers appearance, dimensions, basic functions, workmanship and marking printing of products on the production line, while monitoring production progress simultaneously. It identifies batch defects arising from the manufacturing process in a timely manner, urges factories to adjust production processes promptly, prevents continuous output of non-conforming products, and ensures the overall quality and delivery schedule of mass goods.