HR30W - ASTM E18

  • reference blocks manufactured in accordance with ASTM E18-A4
  • for the annual indirect verification of the scale, the nominal value of the 2 blocks to be used for the calibration is determined by dividing the usable range of the scale into 2 ranges
  • for purpose of routine checking, only one block with a nominal hardness corresponding approximately to that of the tests to be performed will be used
  • available as standard with ISO certificate and optional with UKAS certificate and/or marked with a hexagonal grid ranging from 2 mm to 6 mm (not 0.5 mm) for greater ease of testing