Ithemometha ye-infrared ithemometha eyethula izinga lokushisa isuka engxenyeni yemisebe eshisayo ngezinye izikhathi ebizwa ngokuthi imisebe yomzimba omnyama ekhishwa into elinganiswayo. Ngezinye izikhathi abizwa ngokuthi ama-laser thermometers njengoba i-laser isetshenziselwa ukusiza ukukhomba izinga lokushisa, noma amathemometha angathinteki noma izibhamu zezinga lokushisa, ukuchaza ikhono ledivayisi lokukala izinga lokushisa likude.