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Reference.org
Constantan
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<p>Constantan, also known in various contexts as Eureka, Advance, and Ferry, refers to a copper-nickel alloy commonly used for its stable electrical resistance across a wide range of temperatures. It usually consists of 55% copper and 45% nickel. Its main feature is the low thermal variation of its <a href="/facts/Resistivity/akyCKvMy">resistivity</a>, which is constant over a wide range of temperatures. Other <a href="/facts/Alloy/I7w7WQWR">alloys</a> with similarly low <a href="/facts/Temperature_coefficient/Ayc1aNdm">temperature coefficients</a> are known, such as <a href="/facts/Manganin/eVJG8Agw">manganin</a> (Cu [86%] / Mn [12%] / Ni [2%] ). </p>