Equipped with an external MRV controller. Mainly used for cryopreservation of small volume samples such as embryos, eggs, sperm, blastocysts, bacterial strains, and various cells. Can be used for cryopreservation of low-temperature freezing tubes and wheat tubes. A small host suitable for IVF and freezing sperm/eggs, equipped with a sample rack for freezing wheat tubes and test tubes, with a top opening for easy operation of the "seeding" step of the sample.