How to use:
Lu Banchi is divided into yin ruler and yang ruler, and the upper and lower yin rulers should be used. Positive ruler refers to the measurement of houses, such as office buildings, houses and other buildings, furniture, doorways, rooms and so on. There will be good and bad changes in size. When measured, red is auspicious and black is fierce. The use of yin ruler started from Ding (three inches), and the ancients meant one inch and one inch (two inches), ancestral halls, temples, mausoleum arches, tombstones, stone statues, horses, dolls, memorial halls and so on. Red is an auspicious ruler, and black is a fierce ruler.