PSU-20 midi-size shaker for extraction realizes rotating movement of the platform with the rotation speed fixed by the operator. Speed of the rotation is controlled and indicated on display. Flasks fixating clips are made from stainless steel. The platforms of different kinds for flasks can be supplied on requirement. PSU-20 midi-size shaker for extraction is applicable in all areas of laboratory research & education in biotechnology, molecular biology, biochemistry, microbiology, chemistry, cytochemistry, medicine, gene engineering.