Cassens and Plath Horizon Ultra Sextant The Cassens and Plath Horizon Ultra may be the most popular of the traditional brass sextants available today.  With superb accuracy, the finest construction, and a unique white finish that increases comfort and minimizes distortion, it's a favorite with serious offshore sailors.   The Horizon Ultra is crafted in Germany of a unique brass alloy that makes it exceptionally strong.  Accuracy is guaranteed to 9 seconds of arc.  It features a whole horizon mirror, an illuminated arc and micrometer, a double prism lens to minimize reflections and indicate perpendicularity to the horizon, and a full set of index and horizon shades that include a polarized model.  A 4 x 40 scope is standard, and a mahogany and brass storage box is included. Specifications Arc -5o + 125o, radius 162 mm Accuracy ± 9 seconds, throughout the arc Micrometer Drum 1' scale, vernier to 0.2' Horizon Mirror 57mm diameter Index Mirrors 56 X 42 mm  Shades 3 index (2 fixed, 1 polarized) 2 horizon (1 fixed, 1 polarized) Weight 4 lbs., 10 oz.   Ordering Information 100150 Cassens and Plath Horizon Ultra Sextant Select White or Black body $1499.95 white black 044716 Waterproof Sextant Case Non-metal case construction will not dent, corrode, or conduct electricity.  Silicone O-rings seal out water, salt air, dust, and some gases.  Pre-diced pluck foam is easily removed to form soft, custom-sized cavities. $114.95