CHR-150D Digital Rockwell Hardness Tester is with a large LCD screen. Operation panel uses the menu type structure, its main functions are: selection of Rockwell hardness scale, the choice of plastic Rockwell hardness scale, various guides between exchange of hardness values, hardness test results automatically storage and RS-232 super terminal Settings, the error of hardness value can be modified through input by pressing keys, hardness value more accurately to meet test requirement.