The Bluewater Barometer has a 3.75" dial, a 5.5" base and is 2.88" deep. It is highly reliable with aneroid movement and weighs 10 oz. It is fully adjustable and has inch and millibar scales. It's movements are calibrated for altitudes to 1500' above sea level. It features a precision molded high impact black styrene case with a hinged, glare resistant matte finished bezel and glass crystal. The modern splash resistant case is not susceptable to corrosion and requires little maintenance. Special features include: splash resistant "O" ring seal; easy access hinged bezel; corrosion proof case and scratch resistant glass crystal. It comes with complete instructions, mounting hardware and a limited lifetime warranty.