Lascar EL-USB-2-LCD+ Temperature & Humidity Data Logger, USB, 1 Input Channel(s), Measurement Parameters: Humidity, Temperature, Dew Point, Maximum Temperature Measurement: +80 °C, Power Source: Battery, Best Temperature Measurement Accuracy: 0.3°C, IP Rating: IP67, Minimum Operating Temperature: -35°C, Maximum Operating Temperature: +80°C, Alarm: Yes, Battery Life: 2 Years.