A borescope is an remote inspection tool used to illuminate and magnify objects that are hard to reach or impossible to see directly.
Borescopes are composed of an optical lens or camera attached to the end of a rigid or flexible tube. The tube feeds into an eyepiece or display that allows the user to see the remote object. In the case of a flexible borescope with an inspection camera, a simple electrical cable transmits the image of the object to the display.
Modern borescopes allow technicians to capture still images, record video, and change the viewing position with remote controls. Many are battery powered for field use, with small displays and low resolution suitable for most applications. High end borescopes have sophisticated controls, enhanced viewing and capture features, and high resolution displays.