There are many factors affecting the accuracy of wrist sphygmomanometer measurements, mainly environmental factors, instrumental factors and factors of the person being measured. 1. Environmental factors: Different seasons or different indoor temperatures will affect the accuracy of wrist sphygmomanometer measurements, as warm or cold environments will affect the blood pressure values of the person being measured. Different measurement times can also lead to errors in blood pressure, and there is also a difference between the blood pressure values in the early morning when you first wake up and in the late afternoon. 2. Instrument factor: If there is a problem with the accuracy of the wrist sphygmomanometer itself, it will also affect the accuracy of the blood pressure measurement. 3. The person being measured: If the person being measured has just finished a strenuous exercise, is emotionally intense, or has just taken medication, it can make the blood pressure measurement inaccurate. Measuring blood pressure is recommended to be done under the guidance of a professional, and if abnormal blood pressure occurs, it is recommended to consult a doctor in time.