The standard features of this 6.8 Cu/Ft (193L) Scientemp ultra-low freezer include a Micro-processor-based controller, which sounds an audible and visual alarm. The temperature range is -40C to -85C. It also features manual defrost, castors and keylocking door. 6" circular chart recorder is available at additional cost if required. A phone dialer back-up system is available at a small additional cost; if the alarm goes off it phones a number (like a pager or phone). Other available accessories include a CO2 or Liquid Nitrogen Back-Up System, Freezer Racks, and Access Port Holes for probes, cables or instruments.