Precision quality consisting of 12mm/10mm (approx. 1/2 inch) thick rectangular brass block, non inductive, double covered Eureka Constantan wire or constantan wire is wound on bakelite spool, enclosed in a wood box. Accuracy for Constantan Coil ±0.05% to ±0.1percentage and for Manganin Coil ±0.02percent to ±0.05percent
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