fineness tester

例句：

1. 1. This fineness tester is used to measure the precision of machine parts.
   这个精细度测试器用于测量机器零件的精确度。
2. 2. The engineer used the fineness tester to ensure the accuracy of the new design.
   工程师使用精细度测试器确保新设计的准确性。
3. 3.The fineness tester helped the technician identify any defects in the metal sheet.
   精细度测试器帮助技术员识别金属板材的任何缺陷。