This Non-Destructive Test is used when there is no direct access to the part to be inspected, such as the internal inspection of turbines, engines, etc. an industrial videoscope is used to carry out this type of inspection.
The portable equipment has a 6mm diameter probe with a length of 4 m which has a video camera at the tip that uses LED lighting, it has a variety of focal lenses that allow side view inspection, direct view of short-range, long-range direct vision and stereo vision to carry out measurements by comparative method, it also has an image and video recording system to take evidence of the inspection.