It Can Be Stacked Up To Three Units High, Providing Laboratory Professionals Tripled Culture Capacity, While Still Only Occupying The Same “footprint” Of A Single Shaker. All Models Feature An Insulated, Fold-down Door With Double-layer Glass Window For High Visibility. On All Refrigerating Models, Microprocessor Controller Provides Unmatched Versatility By Enable Users To Create Personalized Program (with Up To 9 Segments, With Cycling) To Automate Changes To Function Parameters.