The SU-300H manual ultrasonic hardness host adopts a modular design with a manual ultrasonic probe HP-1K, HP-2K, HP-'5K, HP-1 OK, Can measure the hardness of flange edges, gear grooves, taper, and other parts; And the inner and outer walls of the shaft and pipeline, container and hardness; The hardness of metal components such as wheels, turbine rotors, and crankshafts; Hardness of cutting tools, drill bit edges, and support seats; Hardness of the heat affected zone (HAZ) of the weld seam; The hardness of the coating layer on injection molding machine screws and other parts; The hardness of the coating layer and copper plating layer on the printing drum and rolling mill. SU-300H can be matched with automated devices such as robotic arms and assembled on heat treatment and machining equipment production lines, becoming a line hardness testing equipment on production lines. SU-300H can be optionally equipped with an electric MP-300, MP-500, MP-800, MP-1000 upgrade the machine to an electric ultrasonic hardness tester.