Article number: 4009816023025 View all of TFA > View more: Hygrometers > TFA - Hygrometer humidity and temperature Save on gas or energy by monitoring the humidity in your home or office. When the humidity in your home or office is high, heating the room costs more energy than when it is low. You can measure humidity with hygrometers. Then you know whether you need to ventilate the room better or whether you need to increase the humidity. These factors influence the humidity level in a room: plants and pets the number of people (due to breathing and perspiration) the degree of ventilation the use of humidifiers activities that use water, such as cooking, showering and mopping. Product specifications Hygrometer Precision - Humidity and Temperature - Indoor and Outdoor Item description Hygrometer Precision - Humidity and Temperature - Indoor and Outdoor Item number 4009816023025 Type Analog Type Measuring = Knowing Measuring range outdoor temperature: -15°C to 55°C Measuring range humidity: 100% Precise synthetic hair hygrometer Chrome-plated brass ring No battery required With stand (removable)