Designed for automotive manufacturing, mechanical processing, and other industries, as well as laboratories in schools and research institutions. A and D models are suitable for hardness testing of low-to-medium hardness materials and high-hardness materials, respectively. To test a sample, place it on a sturdy surface, hold the hardness tester steady, and press the foot of the pressure firmly on the sample at least 12 mm from the edges, so that the pressure needle is pressed vertically into the sample until the foot and the sample are completely in contact for 1 s before reading. This ABS-made hardness tester delivers simple operation with reliable results. It is suitable for quality inspection, factory production and laboratories. This versatile tester can be used to measure the hardness of metals, rubber, and other materials, making it applicable to a variety of scenarios. Use scenarios - In automotive component manufacturing, for in-process hardness checks on metal parts - In mechanical processing and heat treatment environments to verify material hardness before further work - In schools and research laboratories for material property studies