2. Electronic sphygmomanometer is a kind of medical equipment that uses modern electronic technology and indirect blood pressure measurement principle to measure blood pressure. Electronic sphygmomanometer can be divided into arm type and wrist type; Its technology has experienced the development of the first generation, the second generation (semi-automatic sphygmomanometer) and the third generation (intelligent sphygmomanometer). Electronic sphygmomanometer has become the main tool for home self-testing blood pressure.