Karm alloy have common name Nikrothal L/Evanohm/Alloy 800, Karm alloy is made up of nickel,chrome, Aluminum and Iron as the main components. The resistivity is 2~3 times higher than manganin. It has lower temperature coefficient of resistance（TCR）, lower thermal EMF versus copper, good permanence of resistance for a long period of time and strong anti-oxidation. Its working temperature range is wider than manganin (-60~300℃). It is suitable for making fine precision resistance elements and strain.