The beautiful atlantis barometer is highly reliable. It has a 4" dial, a 5.5" base and is 2.88" deep. It comes temperature compensated with aneriod movement. The scales on the barometer are inch and millibar. This barometer''s movements are calibrated for altitudes to 3500'' above sea level. Movements for altitudes from 3,500'' to 7,000'' are available by special order for an additional charge. The barometer weighs 3lbs. 3oz. It''s case has been created from solid, forged brass. Hand polishing and a flawless coat of lacquer add timeless depth and luster. The screw bezel adds the classic nautical look, yet allows easy access to the components when the unit is mounted. It comes with complete instructions, mounting hardware and a limited lifetime warranty.