The units of sphygmomanometers, mainly mmHg and kPa, are converted to 1 mmHg = 0.133 kPa and 1 kPa = 7.5 mmHg, which are both approximate scores. Electronic sphygmomanometers are the preferred sphygmomanometers for measuring blood pressure as generally recommended by the Chinese hypertension guidelines and European and American hypertension guidelines. Electronic sphygmomanometers require relatively low measurement technology, are easy to use, feature-rich, easy to carry, and can avoid human error. As long as the purchased electronic sphygmomanometer conforms to national standards and specifications, and the measurement meets the requirements, its measurement results are accurate and credible. It should be noted that only arm-type electronic sphygmomanometers are currently recommended. Certain wrist-type sphygmomanometers and other APPs for measuring blood pressure are not recommended because their accuracy and repeatability are yet to be evaluated. Omron blood pressure monitor is a kind of electronic blood pressure monitor, the market price generally ranges from about 400 yuan, its quality control and repeatability are better, popular with the general public.