A sphygmomanometer is a medical device used to measure human blood pressure. Its core function is to obtain systolic and diastolic blood pressure values by monitoring changes in intravascular pressure. According to measurement principles and technical differences, sphygmomanometers are mainly divided into three categories: mercury sphygmomanometer, electronic sphygmomanometer and ambulatory blood pressure monitor. The following four dimensions are selected from the working principle, type characteristics, usage methods and brands to expand the analysis: First, the working ...