Nau'in Kj dunƙule thermocouple shine firikwensin da ke auna zafin jiki.Ya ƙunshi nau'ikan ƙarfe guda biyu daban-daban, an haɗa su a gefe ɗaya.Lokacin da mahaɗin karafa biyu ya zafi ko sanyaya, ana haifar da wutar lantarki wanda zai iya dogaro da zafin jiki.Ana yawan amfani da alloys na thermocouple azaman wayoyi.