The endurance II 135 barometer/thermometer measures 5"(Dial) x 7"(Base) x 2 1/2"(Depth) and weighs 2 lbs. Light, strong and durable the endurance II barometer/thermometer in brass is a two-in-one instrument that conveniently combines barometric pressure and temperature gauges in one location. The barometer at the top of the dial 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. The thermometer in the lower portion of the dial displays both Farhenheit and Celsius scales. 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.