Records temperature in the range from -40°C .. +80°C (0.1 °C resolution) with internal and external sensor, and relative humidity 0 .. 100%. Interface: USB Accuracy: from -40°C to -10°C: ± 0,5°C from -10°C to +80°C: ± 0,3°C from 10% tot 90% R.H. : ± 3% <10% en >90% R.H. : ± 4% internal clock: ± 1 hr per year Certificate of calibration: included Bookmark: by pressing the Start button while recording. Memory: 128K samples Alarms: 4 thresholds: High High; High; Low; Low Low