The spectral range of a thermal imager determines the range of wavelengths of infrared radiation that the camera is able to detect. This range is typically between 7 and 14 micrometers, which is ideal for measuring the temperature on the surface of objects. Different spectral ranges may be suitable for different situations, for example shorter wavelengths are often used for detecting high temperatures in industrial applications, while longer wavelengths are suitable for building inspections and energy audits.