Test  seives can apply for powder classfication,liquid filtration,suitable for powder,grain’s percious screen. separated solid from liquid and analyse in experiment, Quality Control section ,there are some benefits such as low noise,high effective and precious,etc.apply STMOTOR advanced generator,produce many buck high fequency shake, standard type, assured the precious;electronic chronotron, you can adjust the screen time according to the material characteristics, control the error, estimate the quality nicety .