Light, strong, and durable, the brass Endurance II 105 Open Dial Barometer is a holosteric, or aneroid, type which measures atmospheric pressures mechanically without the use of liquids. The movement in this compact open dial barometer is temperature compensated, fully adjustable with inch and millibar scales, and is calibrated for altitudes up to to 3,500 feet above sea level. This brass porthole style barometer is weather resistant and guaranteed to never tarnish.