Rulli kõvadusmõõtur, mida kasutatakse pinna kõvaduse ja materjali survetugevuse mõõtmiseks on tavaliselt vastupidav, tootja poolt kalibreeritud põrkehaamer, mis sobib kasutamiseks paberirullide, betooni, kivimite ja ehitusmaterjalide puhul.
A roll hardness tester used to measure surface hardness and material compression strength. Suitable for use with rolled paper, concrete, rock and building materials, this rugged, manufacturer-calibrated rebound hammer is both easy to use and built to last.
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