Physical or chemical properties are recorded with the help of sensors. Multi-sensors are a special type of sensor. They are used for measuring chemical compounds such as carbon dioxide in the ambient air. The data recorded is then sent to a PC for further processing. Multi-sensors for chemical measurements are used in hospitals or factories, for example. Multi-sensors for domestic use can have sensors in a single device for detecting movements, temperature, light, humidity, vibration and UV radiation, for example.