Single sheet thickness (or caliper) can be defined as the perpendicular distance between two surfaces measured under specified conditions and using standard testing methods. In many cases, measurements according to standards are a prerequisite to assure paper quality.
Having accurate thickness measurement ensures precise calculations of important properties, such as bending stiffness. Controlling thickness uniformity means producing paper that performs well in the printing press. Accurate full CD thickness profiles also are an enabler of process optimization.