Extech 445814 Hygro-Thermometer Humidity Alert with Dew Point.

Hygro-Thermometer Humidity Alert w/Dew Point
Ideal for monitoring environmental conditions (temperature, humidity, and dew point) in laboratories, storage areas, manufacturing assembly areas and other controlled environments, this Hygro-Thermometer Humidity Meter features large triple display for easy monitoring of relative humidity, temperature, and dew point.

Features Overview
Ideal for monitoring humid areas where mold can be a problem, this hygro-thermometer features visual and audible warnings when humidity levels exceed high or low limits. This alerts users to adverse conditions, which can help users avoid mold caused by high humidity, as well as static electricity caused by low humidity. Comes with one-year limited warranty. Unlike other humidity indicators, this meter calculates and displays the Dew Point reading, which is a calculation of temperature and humidity and used to determine when condensation will occur. The 445814 has a built-in sensor and measures humidity from 10 to 99 percent RH and temperature from 14 to 140 degrees F (-10 to 60 degrees C) with an accuracy of ±4 percent RH; ±1.8 degrees F.