For more than 35 years, Rochester-founded Gradient Lens Corporation has designed and manufactured Hawkeye precision borescopes for inspecting the hidden interiors of industrial parts and equipment. Its U.S.-made line spans rigid, flexible and video instruments, including scopes built around the company’s patented endoGRINs gradient-index lens design. The company also makes Luxxor video systems and services its Hawkeye instruments, supporting inspection work in fields such as aerospace, metal machining, casting and welding.