(316) 943-7532 (316) 943-7532
Johnson Gage & Inspection Logo A2LA Accredited Logo
Measurement Weights Measurement Weights

Hardness Testers

Rockwell Hardness Testers

JGI performs accredited Indirect Verification per ASTM E18 on Rockwell hardness testers of all models, including manual, automated, standard and superficial, and portable (with additional reference to ASTM E 110), and on all commonly used scales. See our A2LA Scope of Accreditation for Rockwell scales included.

Our Indirect Verification includes servicing and preventive maintenance in accordance with manufacturers' instructions. Our field technicians are prepared to provide replacement items as needed, including setting screws, certified indenters and certified indentor type "W" balls in 1/16" and 1/8" sizes. In many cases, repairs or adjustments can be made on the spot to restore the tester to required performance.

JGI also offers Direct Verification per ASTM E18. This provides a powerful diagnostic tool for assessing the source of calibration error. If a major adjustment must be made in order to restore Indirect Verification performance, the Direct Verification can be quickly performed to satisfy all ASTM E18 requirements for releasing the tester for use.

Brinell Hardness Testers

JGI performs accredited Indirect Verification of Brinell hardness testers per ASTM E10.  Our testing capability covers the full range of 500 kg and 3000 kg scales with a 10 mm indentor. All brands and models are serviced. Portable testers are tested with additional reference to ASTM E 110. Testing includes verification of the measuring device used, in accordance with ASTM E10.

Microhardness Testers

JGI performs Indirect Verification of microhardness testers in accordance with ASTM E 384, for both Knoop and Vickers scales. All brands and models are serviced.


JGI provides certified standard test blocks for all hardness tester methods: Rockwell, Brinell, and Microhardness (both Knoop and Vickers), and in all available scales. Accessories such as anvils, penetrators, Brinell scopes, dash pot oil, elevating screw oil and many other items can be purchased through JGI as well.