This article has class the portable hardness testers, and has analyzed their special performances and the influence factors for the results in detail.

对各种便携式硬度计进行了分类，对它们的各自的特点和性能以及影响试验结果的因素进行了详细的对比分析。

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As for the problem of surface Rockwell hardness measurement of deep hole in measurement field, this article develops a kind of portable micro-control surface Rockwell apparatus.

针对测量领域深孔表面洛氏硬度测量存在的问题，研制了一种便携式微控表面洛氏硬度计。

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As for the problem of surface Rockwell hardness measurement of deep hole in measurement field, this article develops a kind of portable micro-control surface Rockwell apparatus.

针对测量领域深孔表面洛氏硬度测量存在的问题，研制了一种便携式微控表面洛氏硬度计。

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