Oregon Scientific
- BTHGN129 Temperature & Humidity Sensor with Barometer. Additional / Replacement 5 channel sensor designed especially for the weather@home range. Compatible with: BAR218HG, RAR213HG, EMR211 As well as allowing you to use the additional 4 & 5 Channels. Purchasing the optional BTHGN129 sensor also provides RAR213HG & EMR211 owners additional features such as 7 day weather history, 12hr+ Weather Forecast, Barometric Pressure all viewable on your smart phone,