The Weems & Plath Trident Barometer measures: 3"Dial x 4.25"Base x 1.25"Deep. It is made of polished and lacquered brass. It features fully adjustable aneroid movement with inch and millibar scales. It is calibrated for altitudes to 3500' above sea level. It includes complete instructions and mounting hardware. It comes with a lifetime warranty and weighs 6 oz.