VWR Mini Vortexer MV1 

Ideal for a wide range of intensive mixing operations. Simply set speed with knob. Unit starts automatically when tube is pressed down to center of adapter; motor stops when downward pressure stops. Rubber footing holds unit securely to surface and reduces vibration transfer. Motor speed is electronically stabilized and will not change due to manual pressure.

Speed Range: 200 - 2500 RPM

Orbit: 4.5mm