The current hypertension guidelines in China and the hypertension guidelines in Europe and the United States recommend electronic sphygmomanometers as the first choice. Electronic sphygmomanometers have relatively low requirements for measurement technology, are easy to use, feature-rich, easy to carry, and can avoid human error. As long as the electronic sphygmomanometer purchased conforms to national standards and specifications, and the measurement meets the requirements, the measurement results are accurate and reliable. It should be noted that only arm type electronic sphygmomanometers are recommended, and some wrist type sphygmomanometers or other apps for measuring blood pressure are not recommended because accuracy and repeatability have yet to be evaluated. In patients with certain arrhythmias such as atrial fibrillation or frequent premature beats, measurement with an electronic blood pressure monitor may be subject to large errors. In these cases it is necessary to take several measurements and average them, or to choose a mercury column sphygmomanometer for measurement. The use of mercury column sphygmomanometers is not recommended due to the presence of possible mercury toxicity and possible measurement errors caused by human factors during manual measurement as well as the relatively high demands of measurement. However, due to different economic conditions, many remote areas and primary care units now use mercury column sphygmomanometers. If conditions allow, it is recommended to replace it with an electronic sphygmomanometer. It should be noted that regardless of electronic sphygmomanometers or mercury sphygmomanometers, they need to be regularly calibrated and quality-controlled by the relevant measurement and testing departments.