SEXTANT-ASTRA III B MARINE SEXTANT (WITH A PRACTICE BUBBLE HORIZON)

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SEXTANT-ASTRA III B MARINE SEXTANT (WITH A PRACTICE BUBBLE HORIZON)The Astra IIIB has somewhat revolutionized celestial navigation. Never before has such a high quality, accurate, metal sextant been available at such a low price.This is a full size micrometer drum sextant. The frame is made from lightweight aluminum alloy, which resists corrosion. It comes with a full complement of filters, full size mirrors, and full size telescope. The scales are electronically illuminated. Its low price, excellent optics, and choice of horizon mirrors and other accessories make it the perfect selection for beginners. Yet, we know several professional navigators who prefer the ASTRA IIIB merely because they can leave their expensive models at home without sacrificing noticeable accuracy.The ManufacturingThe Astra IIIB is made by the Changzhou Celestaire Instrument Co. in China, in accordance with our specific quality and design guidelines. We are consistently impressed (in fact the first time, surprised) with the degree to which each component of the sextant is tested. For example, each mirror and shade glass is tested for perfect flatness by the Fresnel diffraction pattern method. The sextants are assembled and tested in a clean, professional, environment. Random units have been tested by us and several professional navigators, with results that read more

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