At present, the monitoring of hypertension is mainly measured by electronic sphygmomanometer. After each blood pressure measurement, the electronic sphygmomanometer will display three data respectively on the electronic panel, the first data is called systolic blood pressure, which is also high pressure; the second data is diastolic blood pressure, which is also low pressure; and the third data is heart rate. There is also a case where the doctor writes the patient’s medical record and you can see that the blood pressure is a number followed by a slash, followed by another number, before the slash is the systolic pressure, and after the slash is the diastolic pressure. Once you see a number, how do you determine if it is normal or abnormal? If the high pressure is greater than 140 mmHg or the low pressure is greater than 90 mmHg, it means that the blood pressure is elevated and should be measured again to confirm. If the blood pressure exceeds 140/90 mmHg on three intermittent non-same-day measurements, the diagnosis of hypertension is made. Alternatively, a mercury sphygmomanometer can be used for measurement. Mercury sphygmomanometer measurement to listen to the sound of the pulse beat at the same time, the first sound of the pulse appears when the mercury column position scale systolic pressure, when the sound gradually decreases to the final disappearance of the point scale represents diastolic pressure. Mercury column sphygmomanometer measurement is best done by a doctor, because a certain amount of technical training is required to accurately record the value of blood pressure.