Economic Portable Hardness Tester. Best price, best features on the market today! Portable Hardness Tester specializing in testing large hard metal parts. Designed to test large hard parts: Example: Tool steel should be close to 1 thick of solid material. Loaded with features, this economically priced hardness tester is capable of measuring the surface hardness of a broad variety of metals on flat and round surfaces. This instrument comes complete with the universal D impact device, calibrated test block and rugged carry case.