• "The Nuts and Bolts of Hardness Testing" An informative article from Quality Digest Magazine.
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Purchasing a new Hardness Tester?
Eight questions to ask your supplier

1. ARE THE TEST FORCES VERIFIED DIRECTLY? United´s model TRU-BLUE II forces are verified automatically using a force measuring device traceable to NIST --both at the factory and in the field!
2. IS THE DEPTH SCALE VERIFIED DIRECTLY? United´s model TB-II depth measurements are verified using a scale traceable to NIST-- both at the factory and in the field!
3. ARE THE TEST-CYCLE TIMES PRECISELY CONTROLLED? United´s model TB-II utilizes a microprocessor with a quartz clock to control all its test-cycle times, minimizing operator error.
4. DOES THE TESTER MEET ALL OF THE LATEST ASTM E-18 CHANGES? The United TB-II hardness tester hardware and software were designed to comply with the latest revision of ASTM E-18. United guarantees compliance.
5. CAN THE SUPPLIER PROVIDE ACCREDITED FIELD SERVICE SUPPORT? United's Quality System conforms to ISO 17025 and we offer calibration services accredited by NVLAP and/or A2LA.
6. IS THE TESTER CERTIFIED WITH THE NEW NIST-TRACEABLE STANDARDS? United´s
7. CAN IT MAKE TESTS ON OVERSIZE PARTS WITHOUT THE USE OF A JACK REST? United´s TB-II comes standard with a clamping device allowing for accurate testing on oversize or awkwardly shaped parts.
8. WHERE IS THE TESTER MANUFACTURED? Every United TB-II hardness tester is manufactured and assembled at our facility located in Huntington Beach, California.

If you can´t get the right answers from your current hardness tester supplier, you can contact us.