The successful cryopreservation of biological samples depends on the rate of cryopreservation, precise temperature control, and reasonable temperature gradient. The controlled rate freezer CJ-L37(sample handling equipment before low temperature storage)is designed to satisfy customers' priceless sample cooling treatment before storage and effectively improve the recovery efficiency of frozen cells, to better meet the needs of scientific research, biopharmaceutical, cell and gene therapy, biological sample library and other needs. It is suitable for primary cells and cooling cells that are highly sensitive to temperature changes.