The sampling knife can be used in many different fields: including: quantitative sampling of paper and cardboard; quantitative sampling of textiles, sheet sampling of sanitary products such as toilet paper and sanitary napkins, sampling of sheets such as rubber and plastics, quantitative sampling of films, composite sheets such as flexible packaging Quantitative sampling of shaped raw materials... The sampling device can quickly and accurately cut samples of standard area. It is a satisfactory auxiliary experimental tool for papermaking, packaging and other production enterprises and quality supervision and inspection industries and departments.