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Portable Hardness Tester for Aluminum

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Our customer wants to check the hardness of his aluminum concave/convex disc. He needs a portable hardness tester that he can take to the disc being checked. The aluminum disc is 36 inches in daimeter x 1/4 inch thick. The hardness is supposed to be between 46B and 60B on the Rockwell B Scale. The type aluminum is 6061 T6. Does anyone have any suggestions? Many thanks.

Frank Rutledge
gage repair shop - Phoenix, Arizona, USA

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