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The hardness tester with closed loop control Download
Test methods
  • Rockwell
  • Brinell
  • Vickers
Test load
  • 0.5 - 250 kg
  • Testing laboratory
  • Quality assurance
  • ISO 6508
  • ASTM E18
  • ISO 6506
  • ASTM E10
  • ISO 6507
  • ASTM E92

Combining the best

The ZHU250CL hardness tester employs the latest technology, with closed-loop control for test load application. The modern system for test load application (closed loop) stands out because of its precision. Accuracy exceeds the requirements of all relevant ISO and ASTM standards.

For more sophisticated or for automated applications, PC controlled versions are available as semi or fully automatic systems based on the high definition software (HD).

Customer case: Johann Maier

Fast and reliable hardness testing with the ZHU250CL universal hardness tester. Operation and control of the hardness tester are handled by the Diamond hardness testing software.

Advantages & features

Advantages & features



The ZHU250CL universal hardness tester is suitable for the following test methods:

  • Rockwell
    to ISO 6508 and ASTM E18
    Scales: A B C D E F G H K L M N P R S T V W X Y
  • Vickers / Knoop
    to ISO 6507/ ISO 4545 and ASTM E92
    HV0.5 - HV100 / HK 0.5 - HK 2
  • Brinell
    to ISO 6506 and ASTM E10
    HBW1/10 - HBW5/250


All in one - fast and reliable hardness testing with the ZHU250CL-S universal hardness tester from ZwickRoell:

  • The innovative force application system with closed-loop control provides a better signal-to-noise ratio compared with conventional instruments using load cells. The resulting force accuracy is significantly better than that defined in the relevant ISO and ASTM standards.
  • The unique 4-plus-4 turret allows Vickers, Knoop, Rockwell and Brinell hardness testing without the need for the time consuming task of changing objective lenses and indenters.
  • The unrestricted accessibility to the indenter optimizes the test procedure.
  • With the comfortable and variable test area, a wide variety of specimens can be tested at eye level.

Technical data

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Interesting applications


Name Type Size Download
  • Product brochure: Hardness Testing with ZwickRoell PDF 13 MB
  • Product information: ZHU250CL universal hardness testing machine PDF 762 KB
  • Product information: Mounts for metallographical specimens PDF 252 KB
  • Product information: Indenter PDF 106 KB
  • Product information: Hardness reference blocks PDF 121 KB
  • Product Information: mapXpert – image of hardness testing results PDF 271 KB