A mini magnetic stirrer is a small laboratory device used for stirring small volumes of liquid samples. It typically consists of a small magnetic stirring bar placed inside a container or flask containing the liquid sample. The stirrer itself is a small platform with a built-in magnetic coil underneath. When the stirrer is turned on, the magnetic coil creates a rotating magnetic field, causing the magnetic stirring bar to spin and agitate the liquid, facilitating mixing or stirring of the sample.