The Leeb hardness tester is a portable instrument based on the Leeb rebound principle. An impact body strikes the test surface, and the impact and rebound velocities measured at 1 mm from the surface are converted into electrical signals via electromagnetic induction to calculate the hardness value. It is suitable for a wide range of materials, including steel, cast steel, alloy tool steel, stainless steel, cast irons, aluminum alloys, brass, bronze, pure copper, and forged steel. Widely used in machining, aerospace, automotive manufacturing, metallurgy, rail transportation, mold and casting, research, and equipment inspection, the instrument features a compact and lightweight design, easy operation, and is ideal for on-site testing of large workpieces.