This compact operating board takes advantage of the Deltaphase principle to maintain animal body temperature during surgical or experimental procedures. An eight and one half inch square magnetic operating surface lies in contact with an activated Deltaphase isothermal pad. The underside of the pad is insulated to provide a longer isothermal period. Magnetic Limb Restraints, Drape Holders, LED Light and Magnifier available and are sold separately. Molded wells are provided for sponges, instruments and anesthetic apparatus. The board is functional, durable, and easy to clean. Its low cost and safety make it appropriate for use in student laboratories. The unit is supplied with two Deltaphase pads.