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CONCRETE HARDNESS TESTER

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  • Four double-ended picks with eight points: 2 & 3, 4 & 5, 6 & 7, 8 & 9 on Mohs' Hardness Scale
  • High quality brass pinch vises.
  • A glass plate (hardness of about 5.5) which, when scratched, distinguishes hard from soft minerals
  • A second hardness plate with a hardness value of 3.5.
  • A streak plate for testing a mineral streak color