These racks are available in two temperature ranges for keeping PCR reagents, cells, enzymes and other temperature-sensitive reagents cold on the benchtop. The white model will maintain a temperature of 0°C on the benchtop for a minimum of 3 hours while the blue model will maintain between -15°C and -20°C. Each rack comes with a virtually unbreakable polycarbonate lid for additional sample protection. The dual sided rack can accommodate up to twenty tubes of 1.5ml/2.0ml on one side and 0.5ml on the other. Ideal for temperature maintenance, these racks will keep your samples cool and safe anywhere in the lab!