Similar to the Elcometer 3230 Wet film Wheels, but designed for use in the coil coating process. These Coil Coating Wheels consist of three circles. The outer circles are knerled to allow measurements to be taken on slippery coatings or on fast moving substrates.

By rolling the gauge through a wet coating, the centre disc eventually touches the film. This point on the scale indicates the thickness.

If the volume to solids ratio of the coating is known, then the wet film thickness can be used to predict the dry film thickness.

See also the Elcometer 3230 Wet Film Wheel