Features a Min/Max memory feature, Daily update and is degrees F/C switchable. Can be used as a desktop meter or wall mount. Range is 14 to 122 F (-10 to 50 C) and 25 to 99% RH. Temperature accuracy is +/- 2 degrees F from 32 to 104 and +/- 4 degrees elsewhere. Humidity accuracy is +/-5% from 40 to 80% and +/- 7% over the remainder of the range. 4" x 2.5" x 3/4". AAA battery included.