VEVOR Magnetic Stirrer Stir Plate Kit 0-1500 RPM Adjustable Speed Max 22LProduct Features Adjustable Stirring Speed With a max stirring capacity of 20L and a max stirring speed of 1500 RPM, our magnetic stirrer features a premium aluminum plate with an adjustable speed design. Rotate clockwise to increase the stirring speed and counterclockwise to reduce it. High Stability This magnetic stirrer plate features a powerful magnetic core design that prevents the stirring bar from jumping out, even at its full capacity of 20L.