The interchangeable sensors can be replaced without recalibration, as they store their calibration data in integrated memory and are interchangeable due to high mechanical precision. The thermocouple input T2 is optimized to quickly capture surface temperatures, allowing for direct display of the dew point distance, for example. Applications include heating, ventilation, air conditioning (HVAC), indoor air quality, meteorology, laboratories, research and teaching, energy assessment, building optimization, and investigation of construction damage.