Temperature compensated, aneroid movement. Fully adjustable. Inch and millibar scales. Our standard barometer movements are calibrated for altitudes to 3,500' above sea level. Movements for altitudes from 3,500' to 7,000' are available by special order for an additional charge. The measurements are: Dial: 4", Base: 5-1/2" & Depth: 2-7/8". It weighs 3 lbs. 3 oz.