Perfect-Prime TH0160, USB Temperature & Humidity Data Logger Dewpoint Show, PC Software supports up to Win 10, Thermoemter/Hygrometer (No batteries included) Temperature measurement range: - 40C to 105C Temperature measurement accuracy: 1C Humidity measurement accuracy: 3 % RH Record 21,000 temperature and humidity counts simultaneously Battery: ER14250, 3.6V (not included )