This humidity alert hygro thermometer has a programmable %RH audible and visual alarm that alerts you when humidity exceeds the set limit. Large LCD simultaneously displays temperature, humidity and dew point. Product measures humidity from 10 to 99% and temperature from 14 to 140 deg F (-10 to 60 deg C). The meter has a basic accuracy of +/-4%RH and +/-1.8 deg F/1 deg C. Rear calibration pot for Humidity and temperature. Featuring maximum/minimum with reset functions that store and recall the highest and lowest readings recorded. Comes complete with built-in stand, wall bracket and AAA battery.