The blood glucose instruments used for blood glucose measurement are generally accurate as long as they are recognized by the National Medical and Health Administration and are calibrated on a regular basis. The blood glucose instruments used in blood glucose measurement are more, need to be calibrated before use, pay attention to the use of blood glucose test strips should be consistent with the model of blood glucose meter, in the process of monitoring blood glucose, the most important thing is to determine the fluctuation of blood glucose. The most accurate way to monitor blood glucose is to use a large instrument in the hospital, mainly based on venous blood, the difference between the blood glucose value measured by the blood glucose meter and the venous blood glucose value is not very big, and they are all within the accurate range. It is recommended to consult the endocrinology department of regular hospitals or professional organizations for calibration of blood glucose instruments, which are easy to carry, simple to operate and can be tested by oneself.