IsoFreeze chilling racks provide a stable low temperature environment for 24 x 1.5-2.0ml micro-tubes. Gel filled racks maintain a sample temperature of less than 4°C for up to four hours without refrigeration. Unique color change plastic indicates temperature at a glance. Dimensions: 70 × 105 × 146 mm Color change temperature indicator Keep samples at 4°C Eliminate ice baths