This microtube system makes working with small volume microtubes more convenient. At the center of the system is the microtube rack and lid. The rack is designed to hold up to forty-eight 0.5mL tubes and up to twelve 1.5mL tubes. The lid on the rack holds the microtubes in place. For O incubations, the rack can be placed in the microtube ice bucket where it floats freely. After incubation, the rack can be removed from the ice bucket and used as a handy carrier for the microtubes. Legs allow the rack to stand alone on the lab bench. Hand fabricated from 5/16 in. acrylic, the complete microtube system S1389-162 may be purchased as one piece, or the components may be purchased separately.