The FMP2 expert system, multiwavelength pyrometer has a temperature range of 1470 - 4530F (800 - 2500C) accurate typically to within five degrees. Emissivity is determined with no operator input, even when the target's surface characteristics change with temperature or processing, such as in the sintering of metal and ceramic powders. The FMP2 corrects for product and environmental offgassing and automatically compensates for any "nongrayness" exhibited. Temperature measurement accuracy achieved and emissivity determined are displayed for each measurement and can be logged permanently. The target's thermal spectra and environmental absorption/emission spectra are also available.