Selecting a hardness tester for automotive and metal parts QC should start from real samples, not only machine specifications. The part type, material, heat treatment process, sample geometry, hardness scale, test location, and reporting requirements all affect the best equipment choice. Rockwell testers are practical for fast production inspection. Brinell testers are useful for castings, forgings, and large metal parts. Vickers and Micro Vickers testers are better for coatings, case depth, weld sections, thin layers, and small precision parts. Automatic vision systems can further improve repeatability and documentation. If your factory needs stable hardness inspection for automotive or metal parts, share your sample information before ordering. A complete recommendation can help avoid wrong model selection and improve long-term quality control reliability.