Ambient Weather WH32B Indoor Thermometer-Barometer-Hygrometer for the WS-0900-IP, WS-1201, WS-1201-IP, WS-1401-IP, WS-1550-IP, WS-2000, WS-5000 and WS-5050 Weather Station.
The WH32B is interchangeable with the WS-1000-BTH.
Note, each station listed above only supports one of the WH32B sensors. Channel 1-8 sensor models are WH31E and WH31P which can be found below.
Printed on the part as WH25, WH25B.