1. **Experimental requirements**
   -If you need to handle low viscosity liquids with high sealing requirements, a magnetic stirrer is an ideal choice.
   -For high viscosity or heterogeneous systems (such as solid-liquid mixtures), mechanical stirrers are more suitable.
   -If pursuing ultra uniform mixing or nanoscale dispersion, ultrasonic mixers have more advantages

2. * * Speed and torque**

-The speed of a magnetic stirrer is usually 100-1500 rpm, suitable for gentle mixing.
-The mechanical mixer can reach tens of thousands of revolutions, and some models support stepless speed regulation and torque feedback, suitable for complex working conditions.
-The frequency range of ultrasonic mixers is usually 20-40 kHz, and the power needs to be selected according to the sample volume.

3. * * Additional Features**
-Heating function: Some magnetic stirrers are integrated with heating plates, suitable for reactions that require temperature control.
-* * Program control * *: The model can preset a speed curve, suitable for long-term experiments.
-Explosion proof design: Explosion proof models should be selected when handling flammable solvents.