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8270 Concrete Hardness Tester

Unlike other mineral hardness testing tools, the 8270 is made of metals and alloys of hardness values equal to 2 through 9 on the Mohs hardness scale, so they can be easily ground to sharp points that will not break off. Set includes 8 points, streak plate for testing color, hardness plates (3.5 and 5.5), magnet for detecting magnetic rock, grindstone to keep points sharp, hardness tables, and instructions, all in a compact wooden case.