Cryogenic freezer. This is a chest type unit that will maintain uniform temperatures to -140 and -150 degrees centigrade. It shall have a microprocessor control system, key-operated master switch for power and alarm, washable, reusable condenser filter to maintain peak operating efficiency and full-function safety system. The cabinet shall have a convenient size lid handle and lid locking provision to prohibit unauthorized access. The refrigerant shall be non-flammable and preferably CFC-free