The Starrett 3811A is a state of the art, digital portable hardness tester, designed to test the hardness of large, hard metal parts. The 3811A combines fast test speeds with ample memory and output. It performs tests that easily convert to most popular hardness scales such as Rockwell, Brinell, Vickers and Shore. This compact hardness tester is loaded with useful functions usually found only on high priced models. Digital Portable Hardness Tester.