Premium 6J40 Constantan Resistance Wire is a specialized copper-nickel alloy engineered for high-precision electrical measuring apparatus and current-sensing applications. Featuring a nominal volume resistivity of 0.48 μΩ·m and an exceptionally low temperature coefficient of resistance (TCR), this material guarantees zero electrical drift across wide operational temperature ranges. Produced under strict melt-to-spool quality controls, DLX delivers ultra-fine to heavy-gauge