ASTM D7483-2013A Standard Test Method for Dynamic Viscosity and Derivative Kinematic Viscosity of Liquids Using a Swinging Piston Viscosity Meter is a standard method for the measurement of dynamic viscosity and kinematic viscosity of liquids such as lubricating oils. This method uses the oscillating motion of the piston in the liquid to determine the viscosity, which is suitable for newtonian and non-newtonian fluids. Its advantages include easy operation, fast measurement, and high accuracy, especially for high viscosity liquids. The standard provides a scientific basis for viscosity measurement of lubricating oils, greases, and other liquids, and is widely used in petroleum, chemical, and mechanical lubrication.