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 the quick localization of moisture deposits to identify and address potential mold growth in buildings. The two-color LED above the LCD display facilitates easy handling, providing a quick good/bad assessment that changes from green to red when there is a risk of mold formation. Additionally, an acoustic warning signal sounds. All measurement functions, including air humidity, air temperature, and infrared surface temperature measurement, can operate independently, making this device a practical three-in-one measurement tool. The dew point temperature is calculated from the relationship between air temperature, humidity, and surface temperature. With these technical features, this device is the ideal companion for evaluating rental properties, in the construction and architecture sectors, as well as in various applications in biology and agriculture.