GAOTek surface hardness abrasion resistance tester is suitable for testing the hardness of various types of household appliances such as mobile phone housings, MP3 or MP4 housings, and laptop housings, as well as testing hardness of various types of metal coating, decorative materials, and synthetic leathers. This machine marks the hardness of a product by scratching the coating of the product with a pencil of a certain hardness and the hardest pencil marking that does not cause the destruction of the coating.