The principle of electronic sphygmomanometer adopts oscillometric method, which is accurate in principle. The clinical validation of the electronic sphygmomanometer is designed with auscultation as the standard and using statistical methods. But this does not mean that the results measured by auscultation using a mercury sphygmomanometer are better than electronic blood pressureThe measurement result of the meter is accurate. Of course, it is believed that mercury sphygmomanometers (because mercury sphygmomanometers have been widely used before, leading consumers to habitually think that mercury is more accurate, in fact, the use of mercury is more complicated, and it should be used under the guidance of professional doctors) , and is subject to the doctor's vision, hearing, reflection speed, usage habits, the error of the mercury sphygmomanometer itself, the clarity of the inner wall of the mercury column, and the air tightness, etc. The accuracy of the measurement results of the sphygmomanometer is relatively one-sided. Because the mercury sphygmomanometer is just a pressure gauge, the focus is on the doctor's auscultation through the stethoscope. At present, the use of mercury sphygmomanometers is generally prohibited in developed countries in the world, and electronic manometers (gauges) with higher precision are used. With the enhancement of public awareness of environmental protection, mercury sphygmomanometers will be gradually eliminated from the market (mercury sphygmomanometers have been completely banned in Europe), and it is an inevitable trend to replace them with electronic sphygmomanometers.