This machine is a digital display viscometer, rotor could be rotated constantly by the variable speed motor. Rotate the standard rotor, the rotors will subject to a torque moment proportional to liquid viscosity because of the liquid viscose hysteresis. The torque moment will be measured by the sensors and processed into the viscosity and shown on the display. This instrument adopts micro computer technology, range (rotor number and speed) can be set and the data determined by sensor can be processed conveniently, and the rotor number,speed,viscosity etc.