Features: %RH audible and visual alarm alerts when humidity exceeds set limit Displays Dew Point temperature Max/Min with reset function Humidity: 10 to 99%RH Temperature: 14 to 140°F (-10 to 60°C) Basic Accuracy: ±4%RH; ±1.8°F, ±1°C Specifications: Humidity: 10 to 99% Temperature: 14 to 140°F (-10 to 60°C) Basic Accuracy: ±4%RH; ±1.8°F/1°C Dimensions: 4.3 x 3.9 x 0.78" (109 x 99 x 20mm) 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°F (-10 to 60°C). The meter has a basic accuracy of ±4%RH and ±1.8°F/1°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.