About the pendulum (don't come to me to earn points if you don't know, I'll report it)

These two questions can be asked, and there are such things. If we must know its principle and point out the direction for people's muscles and psychology, of course, this is a scientific statement. Unscientific guide Taobao pendulum tutorial. . I believe those shopkeepers can give you an accurate answer. And all the materials of the pendulum are preferably pure natural materials. After all, people hundreds of years ago would never use resin and nylon rope for divination, which is closer to nature and easier to communicate with heaven and earth. So don't be fooled by Taobao's flashy expensive pendulums. Those comments said that they just received the pendulum. . They are either credulous or paranoid, and they are afraid that they don't even know the running-in period. .