AM120Z series laboratory mixers are driven by compact micro motors and are suitable for mixing low to medium and high viscosity liquids in the laboratory. The machine is exquisitely designed and composed of a drive motor, a friction speed change mechanism and a speed controller. The main mixer is made of high-density die-cast aluminum alloy for the body, and the operation is stable; the speed and torque at the output end are basically constant, and the high and low speeds double the torque. The speed controller uses IC speed detection full constant power speed control technology, which can effectively compensate for the speed changes caused by load changes and power supply voltage fluctuations in real time. The intuitive digital stirring speed on the screen provides a guarantee for data collection. It has the characteristics of large output power, high torque, and simple experiments.