IsoFreeze Temperature Maintenance Systems are available in two temperatures ranges for keeping PCR reagents, cells, enzymes, or other temperature-sensitive reagents cool and stable when removed from the freezer to the benchtop. They also provide protection in the event of freezer power failures. The white model will maintain a temperature of 0°C on the benchtop for a minimum of 3 hours. The blue model will maintain a temperature between -15°C and -20°C on the benchtop up to 3 hours. Both ensure better temperature maintenance. The lid and rack of the IsoFreeze system are manufactured of virtually unbreakable polycarbonate and can accommodate up to 20 x 1.5ml to 2ml or 20 x 0.5ml tubes on the reverse/flip side.