Specifies a method for the determination of dry film thickness by relating dry film mass to dry film thickness. It is not intended to give a precise measurement of the actual thickness of the film. The measurement is obtained by reference to a graph and is intended for use with air-drying paints. Does not involve any mechanical damage to the paint film. Specifies a second method for the measurement of dry film thickness by the micrometer method. The measurement is made after the film has dried to a condition such that the closure of the jaws of the micrometer does not produce any visible indentation of the film. Only suitable for flat surfaces such as sheet material or similar material.