This tester evaluates the flow feature of molten plastic during the forming process. The molten test specimen inside the cylinder that is set at a specific temperature will be extruded from the capillary die. During the extrusion, the shear stress and the shear viscosity is detected to measure the melt viscosity of the test specimen. The tester is equipped with an automatic cleaning system which enables the operator to continuously run 1 test cycle (option of 3 test cycles). The tester can be chosen between the light load type and the heavy load type according to the test specimens maximum load.