NDJ-4 rotary viscosity meter is used to measure viscosity friction and absolute viscosity in liquids. Includes 4 NO.0-4 rotors to choose according to the viscosity and rotation speed of the liquid. Widely used to determine the viscosity of various liquids such as oil, paint, plastic, food, medicine, glue, etc. Widely applied in the fields of petrochemical, medicine, food, light industry, textile industry, and scientific research etc.