Electronic sphygmomanometer is a medical device that uses modern electronic technology and the principle of indirect measurement of blood pressure to measure blood pressure, there are arm type and wrist type, is the main tool for self-measurement of blood pressure at home. Among them, the wrist blood pressure monitor is not suitable for the elderly. Because the blood pressure of the elderly is already high and the blood pressure is viscous, the results measured with this type of blood pressure monitor are already much lower compared to the blood pressure pumped by the heart itself, and this measurement result has no reference value. So the following is mainly about how to use the arm blood pressure monitor to measure blood pressure correctly. 1, before measuring blood pressure should be quiet rest 15-30 minutes. Avoid exercise, drinking, coffee, smoking before measurement, and keep the environment quiet. 2.Sit quietly and comfortably in a chair with a backrest, legs naturally separated, the whole body relaxed, bare upper arm, if the sleeves are too tight, take off the sleeves, upper arm and heart to keep at the same level. 3.Place the cuff on the arm through the metal ring, the end of the cuff tube should be placed on the pulsation point of the brachial artery, the lower edge of the cuff is 2-3cm from the elbow fossa, tighten the cuff, the tightness of the cuff to just put 1 finger is appropriate. 4. Press the pressure switch. During the process of manometry, do not move. Otherwise, there will be a false wave due to muscle movement, making the pressure measurement failure. 5.Measure 2-3 times and take the average value. The interval between two measurements is more than 3 minutes, and the site and body position should be consistent.