Standard Rigid Borescopes are available in a wide range of diameters, working lengths, direction of view and field of view (magnification). The stainless steel insertion tube usable at temperature between -20? and 150? (-4 to 302°F). Video recording available by connecting a CCD camera. Olympus is renowned for optical innovation and the standard borescope is no exception. Each diameter of borescope has it own lens system design, optimized to the available space.