What is the principle of dragon ruler? Does it work?

Dragon-hunting ruler is a pseudo-art, which turns through the imbalance caused by gravity. If you ask yourself a question that you already know the answer to, you will control your hand to lean slightly to that side through psychological suggestion. For questions that don't know the answer, it depends on luck.

Of course, some people may use it well, which is the same principle as divination. It lies in personal cultivation, just like copper coins. Some people are very accurate in divination, while others are ineffective.