Abokai da yawa suna tambaya ko thermocouple da RTD na'urar iri ɗaya ce, amsar da ta dace ba na'urar iri ɗaya ba ce. Kodayake ana amfani da duka thermocouples da RTDS azaman abubuwan gano zafin jiki, ƙa'idodinsu, dalilai, da kewayon zafin jiki sun bambanta.