This dual channel data logger measures and stores over 250,000 temperature and relative humidity readings using up to two external temperature & humidity probes*. It has user-programmable, audible alarm thresholds with confidence/alarm LEDs. 
Its high contrast, dot-matrix LCD with three face-buttons for navigation gives real-time trend analysis, data summaries and the ability to start, stop and restart the data logger without connecting to a PC. EasyLog USB software enables quick configuration and data download via the USB port. Supplied with two lithium batteries, which can typically allow logging for up to 1 year. It can also be powered from USB.
·                            Logging rates between 10 seconds and 1 hour
·                            Stores over 250,000 readings per channel for temperature and humidity
·                            User triggered logging mode
·                            Up to two channels supported (supplied with one probe)
Temperature:
Measurement Range
-30 to +80ºC (-22 to +176ºF)
Accuracy (overall error)
±0.3ºC (±0.6ºF) typical
Resolution
0.1ºC (0.2ºF)
Relative Humidity:
Measurement Range
0 to 100%RH
Accuracy (overall error)
±2.05%RH typical (20 to 80%RH)
Resolution
±0.1%RH
Dew Point Accuracy
±1.1ºC (±2.0ºF) typical
Probe Cable Length
2m (only one probe supplied)
Battery Life
1 year
The EL-GFX-D2 is particularly suitable for any application where you need to separate the logger from its sensor - perhaps for aesthetic reasons or logistical restrictions.  Applications include:
·                            Museums & Exhibitions
·                            Outside Environmental Data