The WS-7395U uses the La Crosse TX8U outdoor temperature and humidity sensor. That part has a $49.99 MSRP. It is $46.95 from La Crosse; see
http://www.lacrossetechnology.com/tx8/index.php to order the part. Other vendors that I checked do not have the sensor in stock for sale separately.
I hope this helps.
Cindy Wells
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