Kinematic viscometer is suitable for measuring the kinematic viscosity of liquid petroleum products. Kinematic viscosity is a measure of the internal friction of a liquid flowing under the influence of gravity, and its value is the ratio of its dynamic viscosity to its density at the same temperature. It is one of the important physical and chemical performance indicators for identifying oil grade and quality. In practical applications, choosing lubricants with appropriate viscosity can ensure normal and reliable operation of mechanical equipment.