The ASTM D4414-1995 (2020) standard provides procedures for the measurement of wet film thickness using a score gauge (also known as a comb gauge). The standard is divided into two measurement procedures: Procedure A is for wet film thickness from 3 to 2000 microns (0.5 to 80 mils), suitable for flat substrates and complex shaped items; Procedure B is for wet film thickness from 25 to 2500 microns (1 to 100 mils), which is also suitable for a variety of substrates and shapes. The standard helps control the dry-film thickness of coatings and is essential for ensuring coating mass.