1.Type A and D are suitable for hardness testing of low to medium hardness and high hardness materials, respectively. When in use, place the sample on a sturdy surface, hold the hardness tester, and press the foot of the pressure firmly on the sample with a distance of at least 12mm from the edges of the test sample, so that the pressure needle is vertically pressed into the sample until the foot of the pressure and the sample are completely in for 1s before reading. 2.Measure the hardness value 5 times at different positions with a distance of at least 6mm, and take the average value. 3.With easy operation and reliable results, this ABS made hardness tester is suitable for professionals in quality inspection, factory production lines, and laboratories. 4.Designed for professionals in automotive manufacturing, mechanical processing, and other industries, as well as for laboratories in schools and research institutions. 5.This versatile hardness tester can be widely used in testing the hardness of metals, plastics, rubber, and other materials, making it applicable to a variety of scenarios.