Blood glucose meter can play a role in monitoring blood glucose, it is recommended to use blood glucose meter correctly under the guidance of a doctor. Blood glucose meter is a kind of electronic instrument for measuring blood glucose concentration, which can play the role of measuring and monitoring blood glucose. Diabetic patients can use blood glucose meter for daily preprandial and two-hour postprandial blood glucose monitoring, which can help diabetic patients better understand their own blood glucose level, and adjust the medication under the guidance of the doctor if necessary. It should be noted that the use of blood glucose meter to measure blood glucose should be strictly in accordance with the instructions for operation, to reduce the measurement results of the error. Moreover, blood glucose meter is not a substitute for venous blood sampling to check blood glucose, and patients are advised to go to the hospital to have their blood glucose concentration checked by blood sampling if necessary. If abnormal blood glucose values occur when using a blood glucose meter, it is recommended to go to the hospital in time.