The sphygmomanometer is used by first holding the manometer in the left hand and the balloon in the right hand, then closing the airflow valve on the balloon and using the right hand to squeeze the balloon to inflate the cuff. When the manometer reading is about 30 points higher than the expected systolic pressure, open the airflow valve and slowly release the air pressure inside the cuff, the reading on the manometer will drop 2-3 points with each heartbeat, listen carefully to the first pulse beat, once heard, pay attention to the reading on the manometer, this reading is the systolic pressure. Then continue to deflate slowly and listen carefully until the sound disappears. When the pulse is no longer heard, note the reading on the manometer, which is the diastolic pressure. Systolic pressure is high blood pressure, diastolic pressure is low blood pressure, in the reading need to pay attention to the eyes line of sight with the sphygmomanometer scale to maintain the same height, do not tilt, so as to avoid inaccurate readings.