Sphygmomanometers include electronic sphygmomanometers, mercury sphygmomanometers (manometers) and spring sphygmomanometers (manometers). Electronic sphygmomanometers are divided into arm type and wrist type; Its technology has experienced the development of the first generation of "air core" (the most primitive arm and wrist), the second generation (arm use) and the third generation (wrist use) of "no air core". Mercury sphygmomanometer (manometer) and spring gauge sphygmomanometer (manometer) are used to measure blood pressure by auscultation. They must cooperate with stethoscope and be judged by doctors or nurses to obtain systolic and diastolic blood pressure readings.
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