SL 413-2007 "Regulations for the calibration of asphalt ductility meters" are applicable to the first calibration, subsequent calibration and in-use calibration of asphalt ductility meters. The purpose of this regulation is to standardize the calibration conditions, items, methods, result processing and calibration cycle, so as to improve the mass of asphalt ductility meter calibration. Before the calibration, it is necessary to fully prepare and strictly implement the operating procedures to ensure the accuracy and completeness of the inspection results. In addition to meeting the requirements of this regulation, the calibration of asphalt ductility meters should also comply with the relevant national standards. This instrument is mainly used to determine the ductility characteristics of asphalt residues after distillation or evaporation.