Because there are many schools of geomantic omen, there are many different kinds of compasses. After Ming and Qing Dynasties, there are mainly three kinds: dichotomy, trisection and synthesis. When choosing a compass, we should first look at the schools of Feng Shui we have studied. If you study situational school, use a binary disk. If you study rational style, use a three-way disk. However, nowadays, feng shui is mostly a combination of shape and gas management, and it is best to use a comprehensive plate.
Compasses are large and small, so the smallest is two inches and eight inches, and the largest diameter can reach one foot and two inches. The big compass is mainly used to detect large buildings, and the small compass is easy to carry, but it is small and easy to make mistakes. Unless you have rich experience, you should choose to be moderate.
To choose a compass that suits you,
First of all, the magnetic needle of a compass should be straight.
Second, the red line at the bottom of Tianchi should point directly to the north and south.
Third, the heavenly heart and the ten roads should be at right angles.
Fourth, the magnetic needle should rotate flexibly.
The disk surface of the inner disk must be neat and clear.
Six, the outer disk must form a flat square.
Pay attention to the material you choose for the compass. Wooden compasses are easy to deform, and compasses made of metal and organic materials are easy to be deformed by extrusion.
Eight, choose the right color. Compasses often use colors to represent yin and yang, so pay special attention to the colors on the compass and whether the logo is correct.