MHB-3000 Digital Electronic Brinell Hardness Tester is a unified product combining optical, mechanic and electronic techniques, which is adopted the precise mechanical structure and computer control closed-circuit system. Without the weights, the instrument loads and unloads the testing force with the motor. By means of the 0.5‰ accuracy compression sensor to feedback the information and the CPU to control, the instrument compensates automatically the testing force lost during the testing.