public standard scale / fair balance
公平秤 [gōngpíngchèng]
1.名词
A public standard scale set up by a market or a government department in charge.It is for customers to check the weight of goods they buy.
工商管理部门要求所有商贩使用公平秤.
The administrative department of industry and commerce asked all the peddlers to use a fair balance.