Harris® Cryostar® cryogenic storage freezers operate at temperatures of 𤩼 C and 𤪆 C. Chest models in the Harris Cryostar range employ a single compressor refrigeration system that avoids the expense and hazard of liquid nitrogen. Uniform temperatures below the critical 𤩲 C glass transition temperature of water are maintained at all shelf levels to improve cell viability. All Cryostar functions are monitored with a standard microprocessor controller for preemptive monitoring of intermittent or chronic conditions affecting system performance, even when the freezer is unattended. The controller features intuitive data entry and display for easy operation. Standard features on low-profile Cryostar cabinets include a minimum of five inches of CFC-free urethane insulation, insulated sub-lids, a keyed lid lock and a one-inch diameter access port. A complete line of optional inventory management systems and accessories - including specially designed racks, boxes and grid dividers - maximize interior storage capacity and improve accessibility to samples.