Aircraft Carrier NAVY Hook Angle Indicator [A5S2]. Fresnel Lens Optical Landing System MK6-MOD 3. ITEM NAME: INDICATOR, ANGLE. B V R TECHNO. FRESNEL LENS OPTICAL LANDING SYSTEM MODEL MK6-MOD 3. You are welcome to physically inspect this item. We are located in a Northwest Suburb of Detroit Michigan. Food and Drug Administration and state andContinue reading