Corning CoolRack thermo-conductive microcentrifuge tube modules eliminate variability which originates from tubes placed directly into ice, dry ice, alcohol baths, water baths and other temperature sources. Place the CoolRack module directly onto a temperature source between -196°C to >100°C and it will rapidly adapt to that temperature. Corning CoolRack thermo-conductive microcentrifuge tube modules eliminate variability which originates from tubes placed directly into ice, dry ice, alcohol baths, water baths and other temperature sources. Place the CoolRack module directly onto a temperature source between -196°C to >100°C and it will rapidly adapt to that temperature.