Ruuvi sensors are recommended to be used within -20°C to +65°C. Don’t place Ruuvi sensor in an environment where maximum operating temperature limits (-40°C to +85°C) might be exceeded. This might damage the electronics. Default batteries delivered with the device are not suitable to be used in extreme conditions (under -20°C or over +65°C).
We recommend using Ruuvi sensors with the included waterproof enclosure to prevent humidity, water or any other conductive element from getting in contact with the sensitive electronic components.