Hardness testing of metal stamping parts is conducted using Rockwell hardness testers. Small, complexly shaped stamping parts can be used to test flat surfaces that are too small to be measured on a standard desktop Rockwell hardness tester. The processing of stamping parts includes shearing, bending, deep drawing, forming, and finishing, among other processes. The main materials for stamping part processing are hot-rolled or cold-rolled (mainly cold-rolled) metal sheet materials, such as carbon steel plates, alloy steel plates, spring steel plates, galvanized plates, tin-plated plates, stainless steel plates, copper and copper alloy plates, aluminum and aluminum alloy plates, etc. The PHP series portable surface Rockwell hardness tester is very suitable for testing the hardness of these stamping parts. Alloy stamping parts are the most commonly used components in the fields of metal processing and mechanical manufacturing. The processing of stamping parts is a method of separating or forming metal sheet materials using molds. Its application range is very extensive. The main purpose of hardness testing for stamping part materials is to determine if the annealing degree of the purchased metal sheets is suitable for the subsequent stamping part processing, as different stamping part processing techniques require different hardness levels of materials. Aluminum alloy plates used for stamping part processing can be tested with a Vickers hardness tester, and a Brinell hardness tester can be used instead when the material thickness is greater than 13mm. Pure aluminum plates or low-hardness aluminum alloy plates should be tested with a Brinell hardness tester. In the stamping part industry, stamping is sometimes also referred to as sheet metal forming, but there is a slight difference. Sheet metal forming refers to the unified method of forming by plastic processing using sheet materials, thin-walled pipes, and thin sections as raw materials, where deformation in the thickness direction is generally not considered.