According to Maigoo's query. Com, Lu Banchi is also called Luban Yin-Yang ruler. The scale above is used to make a house of Yang, called Lu Banchi and Menmi, and the scale below is used to make a house of Yin, called Ding Lan ruler. Yang Zhai, such as houses, commercial buildings and buildings where people live now, and Yin Zhai refers to black and white things used to build tombstones and graves. Therefore, it is Shang Yang.
At present, there are two kinds of Lu Banchi in the market, namely four reds and four blacks. If the size falls on red, it means good luck, and vice versa. And Lu's half-foot view of the top or the bottom is divided according to the specific things built. If you are building a villa, you are looking at the top, and vice versa.