The following equipment
may be needed:
·
Mirrors (especially
small, angled mirrors)
·
Magnifying glasses, eye
loupes, multi lens magnifiers, measuring magnifiers
·
Microscopes (optical and
electron)
·
Optical flats (for
surface flatness measurement)
·
Borescopes and fiber
optic borescopes
·
Optical comparators
·
Photographic records
·
Closed circuit
television (CCTV) systems (alone and coupled to borescopes/microscopes)
originally found here:-http://www.ndtindia.org/visual-inspection.html