ASTM D4444-13 is a standard test method developed by the American Society for Testing and Materials (ASTM) that specifies the laboratory standardization and calibrating process for handheld moisture meters. This standard applies to the measurement of the Moisture content (MC) of solid wood products, including wood containing additives, and is designed to ensure the repeatability and accuracy of moisture meter measurement results through laboratory testing under controlled conditions. The standard details the equipment requirements, testing steps, and data processing methods in the calibrating process, providing a scientific basis for wood processing and quality control.