How about Luo's old compass?

Luo's long-standing compass has exquisite design, accurate calibration and accurate calculation.

Compass is a tool for feng shui detection, and it is also a common operating tool for managing style. It is mainly composed of a magnetic needle and a series of concentric circles located in the center of the disk, and each circle represents the ancient people's understanding of a certain level in the universe system in China. The coordination of the orientation and spacing of each layer on the compass also implies the law of "magnetic field"