The TQC Thermo hygrometer is a simple hand-held digital thermo/hygrometer. Temperature and air humidity are displayed simultaneously. Equipped with MIN/MAX memory, °C/°F selection, HOLD function and dew point indication.The TQC Thermo hygrometer operates 10.000(!) hours on 3 batteries type AAA and switches itself off after 10 min.ATTENTION HUMIDITY SENSOR The Humidity Sensors housed in these products are susceptible to contamination from pollutants such as solvents and exposure to saturated air and therefore are not covered under the 2 year warranty. Furthermore it is expected that the sensor’s readings will drift by up to 0.5% per year.