Kryo 750-30 (frozen inner chamber of 30 liters), Kryo 1060-180 (frozen inner chamber of 180 liters), Kryo 1060-380 (frozen inner chamber of 380 liters), used for freezing steps of medium to large quantities of samples in blood banks, vaccines, pharmaceutical factories, seed inventories, etc. Different sample racks should be selected and configured according to different samples. This type of program freezer is randomly equipped with Delta T software and can be connected to an external computer for programming and storing various programs.