硬度計(jì)是測(cè)量物體硬度的儀器，表示材料抵抗硬物體壓入其表面的能力。它是金屬材料的重要性能指標(biāo)之一。一般硬度越高，耐磨性越好。根據(jù)所測(cè)硬度單位：洛氏硬度計(jì)、維氏硬度計(jì)、顯微硬度計(jì)、布氏硬度計(jì)、邵氏硬度計(jì)、巴氏硬度計(jì)、里氏硬度計(jì)、韋氏硬度計(jì)、肖氏硬度計(jì)、布洛維硬度。根據(jù)使用方式：便攜式硬度計(jì)、臺(tái)式硬度計(jì)。

進(jìn)口硬度計(jì)，美國(guó)Check-Line RX-2100，快速測(cè)量汽車(chē)、輪胎的硬度。

The Checkline RX-2100 Tire Durometer allows racers to quickly and accurately make checks of tire hardness. Unlike other "racing durometers" (which are just relative hardness gauges), the RX-2100 is calibrated to the ASTM D-2240 standard for durometer hardness and is NIST-Traceable. Thus, the RX-2100 allows comparison with the factory tire specifications.

The Check-Line RX-2100 is a handheld gauge weighing only 4.2 oz. The indicator case, bezel, and barrel are all billet machined aluminum. The gauge is furnished with a carrying case and a one year warranty.