The PCR* cooler maintains a sample temperature of 0°C for over an hour and then changes color when the temperature has exceeded 7°C. Superior to an ice bath, it is easy to handle, space saving and free of contamination, which makes it the perfect preparation for PCR* reactions. The temperature of single tubes is indicated by the color of the individual bores. Samples are prevented from freezing by the specially developed cone contour. The cooling aggregate in the universal 96 well format for 0.2mL and 0.5mL PCR* tubes, for tube strips, plates and individual tubes. An innovative solution for protecting, transporting and storing sensitive samples as well as for safely stopping reactions.