When people measure blood pressure, the final measurement result will be inaccurate due to multiple measurements in a short period of time or the tension during measurement. Therefore, the "heart is quiet" will use the visual situation of the measurement process to touch the water surface to cause water ripples to arouse people's emotional resonance. When people press the switch of the sphygmomanometer with their fingers, they see ripples in circles, and their inner tension will be smoothed by the ripples aroused, restoring the usual water-like calm. The shell of the sphygmomanometer is made of frosted plastic material. At the same time, the rounded corners at the front and rear ends are convenient for people to pick up and carry from the flat desktop. The switch pressed in the middle is made of silicone material with soft characteristics. When people's hands touch the soft silicone material, it is more likely to think of the texture of warm water.