roundness measuring instrument

例句：

1. 1.This instrument is used to measure the roundness of a circle.
   这个仪器用来测量圆的圆度。
2. 2.The engineer used a roundness measuring instrument to check the quality of the metal parts.
   工程师使用一个圆度测量仪器来检查金属部件的质量。
3. 3. The manufacturer claims that their roundness measuring instrument is the most accurate in the market.
   制造商声称他们的圆度测量仪器在市场上是最准确的。