Davis Mark 25 Master Sextant with Shock Resistant Case
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DELUXE MARK 25 MASTER SEXTANT with full-field dielectric Beam ConvergerFoam-lined carrying case and neck lanyard included. I dont think this has ever been near water still in original box. Full-field Beam Converger with quartz hardcoat replaces conventional half-silvered mirror. Horizon and astrobody images are combined in a single full-field for easy, reliable sights under the most difficult conditions. Special mineral coating is selective for different wavelengths of light. Horizon is transmitted in one color region and the star or sun in another. Improved reinforced plastic stiffens frame for greater measurement accuracy. High-efficiency LED (solid-state Light Emitting Diode) illumination system, which floods arc and drum with soft light. The LED will last for the lifetime of the sextant. New batteries, which are included, will last up to 10 times longer than with regular bulbs. This is another Davis first! Positive "push-on" switching action, with vinyl boot water protection. Molded of tough, high-impact plastic. 7" (178 mm) frame radius. Graduation 120° to -5° Index mirror rectangular, 1.98" x 1.49" (50 x 38 mm). Precision machined slow travel gear and worm mechanism. Highly visible, easy-to-read micrometer drum and vernier allowing readings to 2/10 minute of arc. Fully ribbed, three-circle sextant body for platform strength
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