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As the "heart" of the aircraft, aero engines are closely related to aviation safety. Nowadays, there are various non-destructive testing tools for testing and repairing it. The use of industrial endoscope for hole detection is one of the routine tasks. It does not need to disassemble and destroy the engine structure, and can perform efficient testing. Accident prevention plays an important role.http://www.riouendoscope.com/industrial-endoscope/