What does the dragon ruler measure?

In geography and geomantic omen, it is also called spirit ruler, dragon hunting stick and dragon hunting needle. The English name is "DowsingRod" and the neutral name is detection stick, which has a history of 5,000 years in China and the West. It borrows the magnetic field sensitivity of the human body, releases subtle and exquisite induction through the physical reaction of the stick, and converts it into visible signals, which can be used to find veins, water sources, acupoints, geomantic omen, missing people, lost things, divination, good or bad luck and so on. Popular in the field of geographical feng shui, it is a necessary wardrobe tool for Mr. Feng Shui. This is to use the sensitivity of the human body to release this subtle and exquisite feeling into a visible and regular signal through the reaction, swing and rotation of a stick, from which people can learn the correct information and engage in the work of searching for people, things, water, veins, historical sites and divination. And it is an accurate anomaly.