Introduction to the balance: The bucket, the large lifting scale and the ancient balance are all ancient measuring instruments. In the 32nd year of the reign of Emperor Guangxu of the Qing Dynasty, in accordance with the regulations of the Ministry of Household Affairs, the coin minting center was changed to "Huai". At that time, all coins minted had to be named after the province. Only the Qingjiang Copper Yuan Bureau of Huai'an Prefecture (located in Qingjiangpu) did not use the provincial name and was named separately. "Qingjiang" or "Huai" is unique in the history of China's modern copper and Yuan Dynasties. It can be seen that Huai'an's economic status at that time was very important and prominent.