' Data Logger, Data Logging, 0 Percent to 100 Percent Relative Humidity Range, +/-3 Percent From 20 Percent to 80 Percent Humidity Accuracy, -4 Degrees to 158 Degrees Temp. Range (F), +/-1.8 Degrees , +/-3 Percent RH Temp. Accuracy (F), 0.1 Percent Humidity Resolution, Sensor Type Capacitance, Bar Graph No , Memory Yes, Battery Type 3.6V Non-Rechargeable, (1/2 AA) 1200mAh, Li-Ion, Auto Power Off Yes, Data Hold No, Data Logging Yes, Interface USB, Calibration Certificate Available Separately '