Tramex AZ8703 Digital Hygrometer. This pocket sized digital hygrometer provides fast and accurate measurement of relative humidity, temperature and dew point of the environment. Features Fast reading (seconds), Hygrometer measures Temperature, -20 degrees C to 50 degrees C (14 degrees F to 120 degrees F), Relative humidity 5 percent to 95 percent with dew point, Min/Max and built in sensor probe,Battery operated (included). Warranty- All Tramex products carry a full satisfaction guarantee including a one year warranty against defects in parts & workmanship and a refund if the unit is returned, shipping pre-paid, in new condition within 21 days of original delivery. Proof of purchase is necessary.