Oregon Scientific thermo/hygro sensor, white, 6.3 x 1.8 x 9.5 cm : Amazon.nl: Garden
Oregon Scientific Store - Oregon Scientific THGR800-OEM Wireless Temperature & Humidity Sensor with display for Professional Weather Stations - Not In Retail Packaging
DIY low power 433MHz TH sensor with 5 year battery life - Share your Projects! - Home Assistant Community