Fine offset HP2550 Operation Manual page 9

Sensor
WH31 Multi-channel temperature
and humidity sensor*,**
WH51 Soil moisture sensor*
WH41 PM2.5 air quality sensor*,**
*Console display just show the current data, the history data save in the SD
card.
**WU website doesn't support. Ecowitt.net can support these sensor data
upload.
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