Data Logger,External RH Sensor,0.9 in. H
5 Percent RH from 10 Percent to 90 Percent RH, Time Intervals 1 sec to 18 hr, Software Required Yes, Interface USB, Includes External RH Sensor Data Logger, Humidity, Temperature, Temp..Range (F) -4 Degrees to 158 Degrees F, Relative Humidity Range 1 Percent to 95 Percent (Non-Condensing), Accuracy +/-2.