CDPH Lead Inspector/Assessor California State Practice Exam

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Which tool is used to measure the Wet-Film-Thickness (WFT) of a coating?

Caliper
Wet-Film-Thickness Gauge
Micrometer
Pressure gauge

The correct answer is: Wet-Film-Thickness Gauge

The Wet-Film-Thickness Gauge is specifically designed for accurately measuring the thickness of a wet coating immediately after application. This tool typically features a series of notches or a dial that corresponds to various thickness levels, allowing users to determine if the application meets the desired specifications for optimal performance and adhesion. Other tools such as calipers and micrometers are generally used for measuring dry film thickness or for precise measurements of solid objects but are not suitable for measuring wet films. A pressure gauge, on the other hand, is used to measure the pressure of gases or liquids, unrelated to film thickness measurements. The unique design and function of the Wet-Film-Thickness Gauge make it the correct choice for this specific application in assessing coating thickness right after it’s applied.