Measure impending weather changes-these aneroid barometers accurately measure atmospheric pressure from sea level up to 2000 feet. They also simultaneously monitor temperature with a built-in glass thermometer. Bimetal element provide temperature compensation. Needs no batteries or external power. They feature an attractive brass case and include a bezel for easy bulkhead mounting. Choose from mbar/mm Hg or mbar/inches Hg models. Dimensions: 6.125" dia. x 2"D. Shpg wt 3.0 lbs.