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https://www.txinstruments.com/products/magnetic-hardness-tester/
Magnetic hardness tester is an intellectual property product independently developed and produced by Shenyang TX Testing Instruments Inc. This magnetic series products include the first generation analog type, the second generation digital type, and the third generation automatic type. In function, it can be classified into magnetic Rockwell hardness tester, magnetic Brinell hardness tester, and magnetic Brinell & Rockwell hardness tester.