Kangtong material is an alloy metal with high resistivity. It is a copper alloy containing 40% nickel and 1.5% manganese. The temperature coefficient of resistivity is low and the resistivity is moderate (resistivity is 0.48 μ ω m). It can be used in a wide temperature range. It has good machinability and weldability, and is suitable for AC circuits, such as precision resistors, sliding resistors and resistance strain gauges. It can also be used as thermocouple and thermocouple compensation wire material.