Abstract: A portable device for verifying and calibrating Rockwell hardness testers has been designed to address some of the shortcomings of existing calibration devices. The device is small in size, light in weight, and easy to carry and operate. The device integrates force sensors, displacement sensors and timers, which can realize the synchronous calibration of the loading load and holding time, depth measuring device, and hardness indication of the hardness tester. The metrological characteristics of the device is tested in the paper, and the calibration results of the Rockwell hardness tester with the device is verified. The test results show that the device has high accuracy and stability, and can meet the requirements for calibrating Rockwell hardness testers.