For Cryopreservation of biological specimens like Sperms and Ova. We are using freeze control systems, precisely designed and control the rate of liquid nitrogen. Modular systems contain a controller for temperature, a cryochamber and a cyrobath. There is no tedious or special installation and with a quick setup packed by user, after following easy steps. The Methods temperature regulation and heat transfer used by these systems are reliable and effective. These patented methods are helpful in preservation of biological substances for long term and have promising results in viability.