This combination device measures air humidity, air temperature, and surface temperature at cold bridges, such as walls and room corners, using infrared measurement. This allows for quick localization of moisture deposits to identify mold growth in buildings and take appropriate countermeasures. The two-color LED above the LCD display contributes to easy handling by providing a quick good/bad assessment, changing from green to red when there is a risk of mold formation. Additionally, an acoustic warning signal sounds. All measurement functions, such as air humidity, air temperature, or infrared surface temperature measurement, can also operate independently, making this device a practical combination of three measurement functions. The dew point temperature is calculated from the relationship between air temperature, air humidity, and surface temperature. Due to these technical features, this device is the ideal companion for evaluating rental properties, in the construction and architecture sector, as well as in various applications in biology and agriculture.