The Hart Scientific 1620A paperless temperature and humidity data logger offers wireless, Ethernet and RS-232 communications. Model 1620A-the DewK-accepts inputs from up to two sensors, which may be mounted directly on the unit or remotely (up to 30 meters away). The unit allows sensor hot-swapping and each sensor contains its own calibration data to prevent downtime during calibration service. Two sensor models are available. The H model reads temperature to ±0.125