DS18B20 digital temperature sensor encapsulated in a waterproof housing for external temperature sensing using the emonTx or Arduino.
Certified genuine maxim DS18B20 sensor
Diameter: 6mm body (approx 6.5mm body + heat-shrink)
Power supply range: 3.0V to 5.5V
Accuracy over the range of -10°C to +85°C: ±0.5°C.
Storage temperature range:-55°C to +125°C (-67°F to +257°F)
Cable: 1m 3-core
1 x encapsulated DS18B20 temperature sensor
emonTx temperature sensing code example
Dallas Temperature Controll Library