automatic hardness tester

例句：

1. 1. This automatic hardness tester is very useful for testing the hardness of metals.
   这个自动硬度测试仪对于测试金属的硬度非常有用。
2. 2. The manufacturer claims that their automatic hardness tester is more accurate than other brands.
   制造商声称他们的自动硬度测试仪比其他品牌更准确。
3. 3. The technician used the automatic hardness tester to measure the hardness of the material before itwas processed.
   技术人员使用自动硬度测试仪测量了材料在加工前的性能。