The endurance II 115 chrome open dial barometer measures 4"(Dial) x 6"(Base) x 3 1/8"(Depth) and weighs 1.25 lbs. Light, strong and durable the endurance II open dial barometer in brass finish is a holosteric or aneroid type which measures atmospheric pressures mechanically without the use of liquids. The movement is temperature compensated, fully adjustable with inch and millibar scales and is calibrated for altitudes to 3,500 feet above sea level. It has a maintenance free, ultra-hard protective coating. It's guaranteed not to tarnish or scratch and is weather resistant. It has a traditional porthole front opening bezel. Beveled glass crystal. Mounting methods for boat or shore. Lifetime warranty on finish and movement.