Seaworthy and classical in style, this Weems and Plath instrument can be mounted to your to the wall in your boat, home or office. Add a Base Unit (sold separately) and it becomes a handsome desktop clock. Aneroid movement. Fully adjustable. Inch and millibar scales. Barometer movements are calibrated for altitudes to 1,500' above sea level. Wt. 4lb. 5oz.