Sphygmomanometers are important tools for monitoring blood pressure and are divided into electronic sphygmomanometers and mercury sphygmomanometers. As electronic sphygmomanometers are more widely used. It is an important tool for monitoring blood pressure outside the hospital. The use of electronic sphygmomanometer, the main points are as follows: a. 20 minutes before the measurement of blood pressure, you can go to the toilet, hold urine will have a certain impact on blood pressure. After that is to sit at the table, do not exercise do not smoke, etc.. Second, after 15 minutes of silence, relaxed mood, the cuff of the electronic sphygmomanometer after the air exhausted, blocked on the left or right arm. Note that it should be flush with the heart, and can not wear thick clothes such as sweaters, cuffs should be in contact with the skin or only have thin clothes. Third, open the start button of the electronic blood pressure monitor for measurement. According to the instructions of the electronic blood pressure monitor, see how much time is measured, the specific electronic blood pressure book instructions shall prevail. Fourth, in the process of measurement, the arms should be relaxed, palms should be open, do not clench fists. Rest 3-5 minutes later to measure again, take the average, that is, the results of this measurement. The best time to measure is one hour after waking up and one hour before going to bed.