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Constantan vs Manganin
Both are copper-nickel-ish alloys with roughly half a micro-ohm-metre of resistivity. The decision is usually made by three numbers and one workshop reality.
Selection notes
Four comparisons that decide a specification
Each note takes two alloys, puts the numbers side by side, and says which one wins for which job — including when the answer is neither.
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Nickel 200 vs Nickel 201
Same resistivity, same density, same drawing route. One number separates them, and it only matters above 315 °C.
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Type K vs Type E
Type E gives you nearly twice the signal. Type K gives you twice the range. Almost every other difference follows from those two facts.
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Manganin 6J12 vs 6J13
Two grades from the same family, differing mainly in resistivity level. The choice is usually made by the resistance value the design needs, not by a property table.
Send the specification — diameter, grade, temper, quantity.
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