* Palm size for narrow space. * Test at any angle, even upside down. * Direct display of hardness scales HRB, HRC, HV, HB, HS,HL. * Large memory could store 50 groups including single measured value, impact direction, material and hardness scale etc. * User recalibration function allowed. * Can communicate with PC computer for statistics and printing by the optional cable. * Backlight display, suitable for low light environment. * Manual or automatic shut down. * Low battery indication.