A Checker's job involves inspecting, verifying, and documenting goods or items to ensure quality, accuracy, and compliance with standards, varying from retail (scanning items, handling cash) to warehouse (inventory, shipments) or manufacturing (product quality) roles, all requiring strong attention to detail, accuracy, and sometimes physical tasks like lifting or counting. Key duties include physical inspection, comparing records, identifying defects, documenting findings, and sometimes customer interaction, ensuring operational efficiency and product integrity.