Sample preparation is an important step in the laboratory and instrument testing process. The quality of sample preparation often directly affects the inspection results of the instrument. A wrong or bad preparation process may result in data errors or even misjudgments. Choosing a correct sample preparation method and device is a special knowledge which involves a variety of expertise. A device with insufficient function results in a failed measurement. However, an over functional device is a kind of " break a butterfly upon the wheel", and it waste the budget.