The Cryo data logger PCE-LTD 100 can record temperatures in the range of -80 °C to +70 °C. The prefix cryo comes from the Greek, where kryos stands for cold. The Cryo data loggers are devices that can measure and record particularly low temperatures. With a measuring range from minus 80 °C, the Cryo PCE-LTD 100 data logger is suitable for temperature measurement during transport and storage of blood plasma, vaccines and dry ice from solid carbon dioxide. Especially when transporting vaccines in connection with Covid-19, it is particularly important to detect the presence of fully maintained cold chains from production to verification. Since some vaccines have to be transported at very low temperatures, this also requires the use of specially adapted measuring technology. Vaccines, which must be stored at70°C, for example, are partially transported in special containers with dry ice. Due to the robust and compact design and the special battery adapted to the conditions, the Cryo data