Simultaneously displays internal and external temperature on a 3 3/16" x 2½" LCD, large enough to be read across a room. Useful as an indoor/outdoor thermometer, in incubators or anywhere simultaneous internal and external readings are required. Has min/max temperature memory. Can be wall mounted or freestanding with easel back. Recall min/max readings over any time period or have it automatically reset itself every 24 hours. The outdoor sensor is mounted on a 9½ cable. Comes with 1 AAA battery which lasts a full year.