2" LCD shows temperature both inside and outside the walk-in, and humidity inside. Inside temperature range of +23°F to +122°F. Outside temperature range of -58°F to +158°F. 10 ft. probe easily reaches into the walk-in. Min/max memory recall. Table or wall mountable (hardware not included). Uses two "AA" batteries (included). If used in temperatures below +32°F, it is recommended to use lithium batteries (not included).