Forged from solid brass that is hand polished and flawlessly lacquered. Highly reliable and accurate double diaphragm German aneroid movement. Displays both of the barometric scales; inches of mercury and millibars. Movement is temperature compensated and calibrated for altitudes up to 3,500 feet above sea level. Dimensions: Dial 5-1/4″, base 7″, depth 3-1/2″. Weight: 7 lbs. 2.5 oz.