Buying a ruler to educate children generally buys that kind of lettering.

It's generally good to buy a ruler, carve disciples' rules, three-character classics, persuade students to learn, and educate children by Zhu Zi. Ruler is a wooden board used by private school teachers to punish students in the old days. The meaning of ruler in ancient times is to warn and admonish students and let them learn something. In today's life, parents and teachers will also use rulers to educate their children. It is better to buy a ruler to educate children. Generally, it's better to buy engravings such as Disciple's Rules, San Zi Jing, Persuasion and Zhu Zi's Family Instructions. This kind of lettering helps children's vigilance education, and also reminds parents and teachers what the purpose of buying a ruler is.