Yes, for ObserverIP models:

WS-0800-IP, WS-0900-IP, WS-1200-IP, WS-1201-IP, WS-1400-IP, WS-1401-IP, WS-1600-IP

you can add up to 8 additional thermo-hygrometer sensors (WH31B):

https://www.ambientweather.com/amwh31b.html

You must make sure you are running Firmware Version 4.4.5 or greater:

How do I update the Firmware for the ObserverIP Module?

 

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