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When measuring the Dry Film Thickness Of liquid coatings applied to galvanized ferrous substrates the most commonly used instrument is the:

When measuring the Dry Film Thickness Of liquid coatings applied to galvanized ferrous substrates the most commonly used instrument is the:
A . Ultra Sonic DFT Gauge
B . Tooke Gauge
C . Eddy Current Gauge
D . Magnetic Gauge

Answer: C

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