The visual inspection is an essential method to ensure a high quality standard of the product. You can get useful information about the quality of the surfaces examined , their geometry , the finish, the presence of wear, corrosion , etc . as well as on the presence of visible defects to the naked eye . It is possible also using tools such as microscopes or lenses ( to identify very small details) or mirrors , borescopes and endoscopes that allow the inspection of areas otherwise not accessible .
