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"For sailors facing extreme saltwater environments, this is the waterproof quartz clock for you. The Weems and Plath Nautilus Clock combines exceptional quality construction and performance that are suitable for any extreme marine environment.\r\nThe low glare, satin black case is constructed of solid aluminum. It is color anodized and sealed so that the finish will not peel, bubble or tarnish in extreme heat or cold.\r\n\r\nPrecision quartz movement: accurate to +/- 15 seconds a month\r\nDisplays both 24 hour and 12 hour clock\r\nWaterproof to a depth of 100 feet\r\nGlass crystal sits in a double O-ring seal for vibration, impact and thermal expansion protection\r\nAnodized aluminum dial is laser engraved\r\nDurable moveable red markers are made of U.V stabilized polycarbonate and located outside the crystal for marking time\r\nTo calibrate movement, twist case 1/8 turn to remove case and leave back plate on bulkhead. Also convenient for storage or anti-theft reasons\r\nAA battery, instructions, and stainless steel mounting hardware included\r\nWeems and Plath lifetime warranty\r\n\r\n&amp;amp;nbsp;\r\nDimensions: &amp;amp;nbsp;Dial: 3 3/4&amp;quot; (95 mm)&amp;amp;nbsp;Base: 5 7/8&amp;quot; (149 mm)&amp;amp;nbsp;Depth: 2 1/2&amp;quot; (64 mm)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.apsltd.com/nautilus-waterproof-quartz-clock-hts.html>