120V Maxi Mix® I Vortex Mixer with Rubber Pad. The Maxi Mix® I by Thermolyne® features a soft foam rubber pad that permits vortex mixing of 1 - 4 test tubes simultaneously, depending on tube diameter. Excellent for mixing the contents of small flasks with closed tops. Convenient top-mounted push button on/off switch can be activated with either a finger or test tube. Vary vortex mixing by simply changing the pressure of the tube or flask against the foam pad. Clean, white durable plastic case is both acid and alkaline resistant. Special rubber feet prevent mixer from moving during operation. Supplied complete with one extra foam top (M4820-3), power cord and plug. 120V. Thermolyne #: M16715Q.