The Leeb hardness tester is a hardness measurement instrument based on the Leeb rebound principle. An impact body with a specified mass strikes the test surface from a certain height, and the impact and rebound velocities at 1 mm from the specimen surface are measured. Using the principle of electromagnetic induction, the velocity values are converted into electrical signals to calculate the Leeb hardness value. Applicable materials include steel and cast steel, alloy tool steel, stainless steel, gray cast iron, ductile iron, cast aluminum alloy, brass, bronze, pure copper, forged steel, and other metallic materials. It is widely used in machining, aerospace, automotive manufacturing, metallurgy, rail transportation, mold casting, academic research, pressure pipeline inspection, and special equipment inspection industries. Featuring compact size, light weight, portability, and easy operation, the Leeb hardness tester is especially suitable for on-site hardness testing of large workpieces.