TR41A Bluetooth Temperature Logger, with internal sensor, range -40 to +80°C, accuracy ±0.5°C, logging rate selectable 1 second to 60 minutes, 16,000 reading memory, battery life 1 month to 1.5 years depending on sample interval. Dimensions 62 x 47 x 19mm, IP 67 housing. Data download to smartphone (Android or IOS) via Bluetooth 4.2 Low Energy. Data is then automatically uploaded to the free web service for analysis, download to CSV and printing of reports. ...