Throughout the wafer fabrication process, rigorous quality control is maintained using a variety of inspection and metrology equipment to detect defects and ensure dimensional accuracy. Key suppliers in this category include KLA Corporation and Applied Materials from the USA, and Hitachi High-Tech and Tokyo Seimitsu from Japan. Other suppliers include ASML (Netherlands), Canon (Japan, USA), Nikon (Japan, USA), and various companies from the USA, Japan, and Canada. The USA and Japan are the leading countries for sourcing wafer inspection and metrology equipment, reflecting the critical importance of quality control in their semiconductor manufacturing industries.