At present, many families choose rapid blood glucose meters to monitor blood glucose because of its simple operation, low technical requirements, small blood volume and relatively accurate test results. But although the "weapon" is good, serious consequences may result from improper use. Whether it is a home blood glucose meter or a hospital blood glucose meter, the measured blood glucose value may be different each time. In general, as long as the error does not exceed ± 20%, it is within the normal range. However, some errors caused by improper human treatment and operation can be avoided.