core hardness penetrator

例句：

1. 1. The core hardness tester was used to measure the hardness of the steel samples.
   用核心硬度测试仪测量了钢样品的硬度。
2. 2. The core hardness gauge is essential for determining the quality of the castings.
   核心硬度计对于确定铸件的质量至关重要。
3. 3. The core hardness tester was used to determine the optimal processing conditions for the steel.
   使用核心硬度测试仪确定了钢材的最佳加工条件。