Hole rulers, feng shui ruler (Feng Shui Ruler Luban – 魯班 尺) is very popular in Eastern cultural life. In Vietnam there are many variants, due to differences in concept, in the process of introduction, transformation from Chinese ruler to Vietnam, and even negligence in the production process, leading to many variations. Users do not know which ruler to use for accuracy. EBM will analyze so readers can use the right size for their purpose.

There are 3 main types of hole rulers:

• Board hole size 52.2 (52) cm: To measure hollow blocks (measuring the heart), clearance spaces in the house such as: window, open box, main door, door, window.
• Board hole size 42.9 (43) cm: For measuring solid blocks (measuring cover), details in the house, furniture: cabinet bed size, kitchen pedestal, steps.
• Board hole size 38.8 (39) cm: To measure the size of the sound: grave, urine, cup, altar.

Rulers 42.9 and 38.8 are now pre-printed on rollers or sold in stores (however, 38.8 Vietnam rulers are often deviated by 2mm / yard compared to Chinese rulers), while 52.2 are very rarely, mainly find materials in books, feng shui experts.

The hole hole imported to Vietnam was originally printed in Chinese characters. When returning to Vietnam, most of the people do not understand the language and do not understand the application of the rulers, so they should either “black out, use red” or “two black ones will quit, two red ones will use” and also do not understand the meaning The number on the ruler.

Readers should thoroughly understand the intended use to choose the correct hole size.

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