Currently commonly used blood pressure monitors include mercury column blood pressure monitors and electronic blood pressure monitors, mercury column blood pressure monitors measure with higher accuracy and are still used by many hospitals today, it needs to be used in conjunction with a stethoscope and its average price is between 80-100 yuan. Before each measurement, you need to check whether the mercury scale is at zero, and pay attention to the deflation speed of the balloon when measuring, too fast and too slow will affect the measured value of blood pressure, so you need to practice more before applying the mercury mercury sphygmomanometer. Another type of blood pressure monitor is the electronic blood pressure monitor, which has an average price between 200-500 yuan, and it is relatively easy to operate and suitable for home use. It does not need a stethoscope to be able to effectively measure blood pressure and pulse, press the button to automatically inflate and deflate, the value is directly displayed on the screen, especially for the elderly, but its measurement value there is a certain error, need to be regularly calibrated.