The TAPPI T 410 standard specifies a test method for the weight per unit area (quantitative) of paper and Cardboard. This method calculates the mass per unit area (g/m2) of paper or Cardboard by measuring the area and mass of paper or Cardboard. It is an important indicator for evaluating the size and mass of paper. In the United States, it is usually expressed in "basis weight" or "weight", while in the international world it is expressed in grams per square meter (g/m ²). This standard is applicable to the production and quality control of paper, Cardboard and related products, providing an important quantitative basis for the buying and selling of paper.