Oregon Scientific THGR238 Cable Free Pro All Weather Thermo-Hygro Sensor | eBay
Digital Wireless Thermo-Hygrometer (EMR963HG) w/Remote Sensor | Inspect USA
Logia Wireless Hygro-Thermo Sensor, Add-on for Weather Station LOWSA110THW - The Home Depot
MISOL/Spare part for weather station (Transmitter / thermo hygro sensor) 433Mhz, with solar panel [WS-TR02S-1] - $21.29
1 Unit of Spare Part for Weather Station (Transmitter/Thermo hygro Sensor) 433Mhz,Replacement Thermo hygro Sensor for Weather Station,to Test The Temperature Humidity : Patio, Lawn & Garden - Amazon.com