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“I wanted to say thank you to the LTI Team for all the support they have provided in our source inspections, as well as on expedited projects. It is nice to work with a group that not only has technical knowledge, but cares about getting the job done right the first time. I know I can count on the LTI team to help me in many situations. N.G.K. Metals looks forward to many more years of working with you.”

David Britt,
N.G.K. Metals Corp.


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Hardness Tester Calibration

Hardness Tester CalibrationHardness tester calibration should be performed on a periodic basis to verify that the accuracy of the instrument is within the manufacturer’s stated tolerances for the grade or model. Hardness testing measures the relative resistance of a metal or other material to denting, bending, or scratching. This measurement is only as reliable as the accuracy of your tester.

During hardness tester calibration, LTI Metrology will determine the accuracy of the instrument, make the necessary adjustments to bring it back within the manufacturers’ tolerances and certify it back to the National Institute of Standards and Technology (NIST). LTI Metrology near Philadelphia, PA is A2LA accredited and equipped to provide on-site calibration at your facility for all models of micro-hardness, Vickers, Knoop, Rockwell and other models of Hardness Testers,  per the applicable ASTM Standard. Rockwell Hardness Tester calibration to C, B, A and E Scales and Superficial Rockwell Hardness Tester calibration including 15, 30, 45 N&T Scales are performed.

Our field calibration specialists also provide preventative maintenance and repair services. LTI Metrology can supply indenters, blocks and new hardness testers.

The Hardness Tester Calibration Process

Prior to Rockwell hardness tester calibration, the machine is leveled and inspected for chips, breaks or cracks. The calibration process involves verifying the condition of the anvil and indenter, then running five hardness tests on three certified hardness test blocks, representing the high, middle and low ranges on all scales being verified. If the instrument reads within the tolerances of the test blocks, the machine is deemed certifiable. This method of verification takes into account and combines all of the variables that produce the actual hardness number, just as would be done during actual testing.

LTI Metrology Capabilities

Calibration for most models including:

  • Rockwell scales C, B, A and E
  • Superficial Rockwell to 15, 30, 45 N&T Scales
  • Vickers & Knoop
  • Brinell
  • Micro-hardness testers
  • Leeb testers
  • Durometer testers
  • Analog manual and digital load cell types
  • Portable testers