Both the WH31 and WH31B are 8-channel thermo-hygrometers that support a variety of Ambient Weather Stations.

The WH31 includes a radio controlled clock (RCC). The WH31B does not.

The WH31 is only required for the WS-3000, which includes a Radio Controlled Clock.

Our Internet Connected weather stations receive the time from the Internet Time Server (NIST.gov).

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