SOLD -Ideal for simultaneously mixing contents of up to four test tubes or small flasks with closed tops, the Barnstead/Thermolyne (Thermo Scientific) Maxi-Mix II vortex mixer (rotary shaker), model no. M37615, agitates from 100 to 3000 rpm. Item operates in continuous-run or touch-activated run modes. The white, durable plastic housing resists acids and alkalines while the heavy-duty cast metal base with rubber feet assures stability and eliminates creep during use.Condition: Tested, fully operational, clean, previously-owned, used. The 3-1/2-inch rubber platform is in good shape. Sold as is without warranty expressed or implied. Buyer is responsible for determining the suitability of this product for their application.Note: Photos above are those of a sold unit; however, we have one mixer that looks exactly like it, except for the brown (not teal as shown above) label. Photos of the unit for sale are available upon request.