Amazon.com: Oregon Scientific THGR122NX Water Resistant Remote Sensor W/ LCD Display Measures and Displays Humidity & Temperature from -22F to 140F : Patio, Lawn & Garden
Temperature Sensor 433 MHz from Nico on Tindie
Oregon Scientific THGR268; Wireless Temperature & Humidity Sensor, RF transmission Frequency : 433 MHz; Number of channels : 3; RF transmission Range : maximum 30 meters; Temperature sensing cycle : around 40 seconds (THGR268 TH-GR268 THGR-268 THG-R2