The precise WEMPE NAUTICAL barometer measures atmospheric pressure in a manner that the weather of the following two days can be forecasted. Due to this special feature, the barometer is one of the most important instruments at sea. Such prediction can also be of advantage on land, which makes the WEMPE barometer a useful and at the same time decorative element of private rooms and offices. This WEMPE barometer is 120mm in diameter with a 78mm clock face in white. Specifications Instrument: Barometer Size of clock face: White clock face with black numerals Material: Brass Movement: Barometer Scale: Atmospheric pressure in hPa/mmHg Barometer - Accuracy: +/- 2 hPa between 980 - 1030 hPa' Barometer - Measuring range: 940 to 1060 hPa, 700 to 790 mmHg Barometer - Number of aneroid capsules: 1 Barometer - Range of operating temperature: +4°C to +50°C' Barometer - Temperature error: +/- 2,5 hPa at sudden change in temperature of +/- 10°C' About Wempe "Leisure sailors worldwide rely on the quality and precision of their instruments and many famous cruise liners, mega yachts and German and international cargo, research and navy vessels are equipped with Wempe clock systems.Wempes devotion to their fascination of sailing and the exacting task of manufacturing precise maritime instruments, and nautical timekeeping systems, is why they are the market leader and pioneer in developing and creating new products."