Visual Inspection involves the visual observation of the surface of a test object to evaluate the presence of surface discontinuities such as corrosion, misalignment of parts, physical damage, and cracks. Visual testing can be done by looking at the test piece directly, or by using optical instruments such as magnifying glasses, mirrors, borescopes, and computer-assisted viewing systems. This is arguably the oldest and most widely used NDT method. VT can be applied to inspect castings, forgings, machined components, and welds. Industries utilizing this service include Fabrication, Construction, Automotive, Power Generation and Transportation. These inspections are performed to meet IS, BS, ASTM, AWS, ASME (American Society for Mechanical Engineers) and many other standards.