How much is a steaming gossip instrument?

Zheng Likang's configuration is not as high as that of the Eight Diagrams Instrument, and it is based on the balance of Yin and Yang in Huangdi Neijing, which combines three natural minerals: Bian Shi, tourmaline and moyu. You can find out the function of these three stones. Definitely better than tourmaline. Because they form a balance of yin and yang, they are not simply releasing far infrared and negative ions. Zhenglikang uses a far infrared detector to release infrared rays, and only tourmaline has an effect. Taobao price is 6980. Choose which one is right.