A Borescope or Boroscope is used for inspection of inaccessible areas. It is ideal for a non-destructive testing and visual inspections looking for defects, imperfections, or other problems. They are used in a wide range of applications and come in a variety of versatile styles to suit any need. The origin of the word comes from the need to inspect the bore of large guns. Use of a borescope may save considerable time and expense by avoiding a more thorough maintenance teardown.