How to use Lubanchi:
1, good or bad judgment: a square ruler, length 10 city inch, that is 1 city ruler; Every inch is marked with colors, namely: one white, two black, three green, four blue, Huang Wu, six white, seven red, eight white and nine purple; Take the inch as the standard, and one inch, six inches and eight inches are auspicious; To put it bluntly, the size of the door should be one inch, six inches and eight inches, which is a good door.
2. Measure Lu Banchi with a ruler: Lu Banchi sold in the market is marked with red and black, so it is lucky to put the required length on the "red" of Lu Banchi. Measure it with a ruler. If the required length is placed on the "white (one white, six white, eight white)" of the ruler, it is auspicious.