The application includes additional features:
- Ruler Lu Ban
- Khai Son Lap Huong, Good direction, good month to build a house, repair the house
- See age-appropriate direction

Ruler Lu Ban is widely used in real life, in measurement and in many fields such as the main door sizes, side doors, ceilings, altar sizes, kitchen pedestals, etc. is made to meet the needs of the people, architects, feng shui masters, builders ... in finding the desired beautiful size towards a better, luckier life.

In house construction and home repair, three types of Lu Ban ruler are commonly used: 52.2cm (clear water), 42.9cm (Duong Trach), and 38.8cm (negative). In the past, feng-shui used to use the wooden Lu Ban ruler, but today for the convenience of checking the hole ruler, this ruler is built into all kinds of drawers including the 5m, 7m drawbar, 10m for user convenience. When using a ruler, just choose the right size in the red bow (both large and small bow on the ruler) to have a nice size, and choose which red bow is depending on the wishes of each family.