The wrist sphygmomanometer is relatively easy to use. The wrist strap is wrapped around the wrist and the switch is pressed to automatically read the blood pressure. The wrist sphygmomanometer is easy to carry, but the measured value will have a certain deviation. Therefore, when choosing a sphygmomanometer, try to choose an arm or mercury sphygmomanometer with a mercury column. Regardless of the type of blood pressure monitor, the patient should rest for 10-15 minutes before measuring the blood pressure, should not be strenuously active half an hour before measuring the blood pressure, avoid tension and anxiety, and avoid taking excitatory drinks, such as tea, alcohol, cola, etc. When measuring blood pressure after resting, make the forearm or upper arm at the same level as the heart, take one measurement on the left and right, and then take the average value of blood pressure.