Ainihin an ƙaddara don kera ƙananan zafin wutar lantarki don haka kamar igiyoyin dumama, shunts, juriya don mota, suna da matsakaicin zafin jiki na 752°F.
Don haka ba sa tsoma baki a fagen juriya ga murhun masana'antu, sun fi sanin CuNi44 (wanda ake kira Constantan) yana gabatar da fa'idodin ƙarancin zafin jiki.