Temperature compensated, aneroid barometer movement. Fully adjustable. Inch and millibar scales. Our standard barometer movements are calibrated for altitudes to 3,500' above sea level. The thermometer displays temperature in both Fahrenheit and Celsius on the left scale, and the hygrometer shows % of relative humidity on the right. The measurements for this instrument are as follows: Dial: 5-3/4", Base: 7-1/8" & Depth: 1-7/8".