reference vacuum gauge

例句：

1. 1.The engineer used the reference vacuum gauge tomeasure the pressure in the chamber.
   工程师使用参考真空计来测量腔室中的压力。
2. 2.The technician was instructed to check the referencevacuum gauge before starting the pumping process.
   技术人员被指示在开始抽气过程之前检查参考真空计。
3. 3. The manufacturerrecommends using a referencevacuum gauge for accurate readingsduring testing.
   制造商建议在测试中使用参考真空计以获得准确的读数。