The condition of the surface of the examination part, the defects and discontinuities on the surface are the examination of all signs that affect the quality with or without the use of ancillary equipment.

Visual Inspection is probably the oldest and most widely used method in many industrial and commercial applications, which seems simple but has its own fine details, Non-Destructive Testing (NDT) method. In practice, it is carried out before another non-destructive testing method is used, and the control is carried out by following the sequence of operations from very complex to simple.