Dry film thickness gauges are instruments used to measure the thickness of a dry coating, such as paint or powder, on a surface. These gauges help ensure that the coating meets specified requirements for performance and durability. They are commonly used in industries like automotive, aerospace, and construction. There are two main types of dry film thickness gauges: magnetic and eddy current. Magnetic gauges are suitable for measuring coatings on ferrous substrates, while eddy current gauges work on non-ferrous materials. Both types provide quick and accurate measurements, making them essential tools for quality control in coating applications.