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Eddy current DFT gauges are used to measure Dry Film Thickness in which of the following situations:

Eddy current DFT gauges are used to measure Dry Film Thickness in which of the following situations:
A . Magnetic coatings applied to a magnetic metallic substrate
B . Non-Conductive coatings applied to a conductive metallic substrate
C . Conductive coatings applied to a magnetic metallic substrate
D . Conductive coatings applied to a cementitious substrate

Answer: B

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