Gi incorporates hole inspection optics to specifically image and measure both the bottom of a hole and its vertical walls. This allows great detail of I.D. and the detection of very small defects like; Chips in threads, weld splatter, blocked holes, damaged/torn thread, reamed threads, short or missing thread(s).   And optional, Eddy Current lets you check for metallurgical defects such as hard vs soft parts, full length of part seams, missing conductive plating.