"ASTM D5478-13 (2022) Standard Test Method for Determining the Viscosity of Materials with Drop-Needle Viscometer" specifies the standard test method for determining the viscosity of liquids and rheological materials using Drop-Needle Viscometer. Through this method, the viscosity of materials can be accurately measured under controlled experimental conditions, and it is suitable for various liquid and semi-fluid materials, such as paints, coatings, chemicals, etc. Drop-Needle Viscometer is widely used in the Coating, Food, Chemical and Pharmaceutical industries due to its advantages of simple operation and accurate measurement. The standard provides detailed technical guidance for ensuring the Reliability and conformity of measurement results, helping related industries to carry out product quality control, R & D and production process optimization.