A borescope is a specialized optical device used to inspect the interior of objects that are difficult to access, such as engines, pipes, or machinery. It typically consists of a long, flexible tube with a camera and light source at one end, allowing users to view hard-to-reach areas without disassembly. Borescopes are commonly used in various industries, including aviation, automotive, and manufacturing, to detect wear, corrosion, or other issues. They can help save time and costs by providing a visual inspection without the need for extensive repairs or replacements, making them an essential tool for maintenance and quality control.