Inspect Cross Holes - Check Internal Bores - Look in Mold Cavities

A Borescope is an optical device consisting of a rigid or flexible

tube with an eyepiece on one end, an objective lens on the other
linked together by a relay optical system in between. The optical
system is usually surrounded by optical fibers used for illumination
of the remote object. An internal image of the illuminated object is
formed by the objective lens and magnified by the eyepiece which
presents it to the viewer's eye. Rigid or flexible borescopes may
be fitted with a video or CCD camera.