When it comes to forecasting weather, the 120mm large WEMPE thermometer/hygrometer combination of the NAUTICAL Series does an honourable job. It measures the relative humidity level - a high level suggests upcoming fog. This instrument has been used at sea for more than 200 years. The thermometer is another marine instrument with long-standing tradition. It shows temperature in °C and °F on a white 78 mm clock face. *Please note this a new product but doesn't come with its original box* Specifications Instrument: Thermometer, Hygrometer Size of clock face: White clock face with black numerals Material: Brass Scale: Temperature in °C/°F, Humidity level in % Hygrometer - Accuracy: +/- 3% between 40 - 90 %' Hygrometer - Humidity sensor: Synthetic fibre Hygrometer - Measuring range: 0 to 100 % Hygrometer - Range of operating temperature: -10 to +50 °C' Thermometer - Accuracy: +/- 1°C between -10°C to +50°C' Thermometer - Temperature sensor: Bi-metal 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."