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the Knoop HK0.3 hardness reference blocks are manufactured by BUDERUS (D) and delivered as standard with a DAkkS certificate issued by the independent Materialprüfungsamt Nordrhein-Westfalen (MPA NRW) laboratory.
each block is measured to the highest levels of precision according to EN ISO 4545
for hardness test blocks, certified by MPA NRW, there is an excel sheet available where the calibration value, the limit deviation and the tolerable repeatability of the hardness tester as well as the measurement uncertainty of the test block of hardness are noted. By means of this sheet, a cyclical check of your hardness checks can be documented effortlessly within the framework of quality assurance.
available in triangular steel blocks 35x35x35x6 mm except 140 HK (70x70x70x6 mm)