1. Expand the arm band, let the black stick in the outer layer, put on the metal ring (the original has been put on);

2. the left arm with arm band, so that the trachea interface in the middle finger extension line;

3. Tighten the arm band, so that the tail in the back of the arm back down, sticky;

4. Stick good arm band, slightly adjusted, so that the lower edge of the arm from the elbow fence about a width;

5. The tracheal joint is inserted into the stomata on the left side of the electronic sphygmomanometer and can be measured.