smoothness tester

例句：

1. 1. The engineer used a smoothness tester to measure the surface roughness of the machined parts.
   工程师使用平滑度测试仪来测量加工零件的表面粗糙度。
2. 2. The smoothness tester was used to check the quality of the new material before it was used in production.
   平滑度测试仪被用来检查新材料在生产前的质量。
3. 3. The smoothness tester is an essential tool for inspecting the surface finish of metal parts.
   平滑度测试仪是检查金属部件表面光洁度的必备工具。