Gravity - kit with temperature sensor DS18B20 - DFRobot KIT0021 from Waterproof probes category available to buy in a robotic shop Botland. Very fast shipping!
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DS18B20 Waterproof Digital Temperature Sensor Kit - RobotShop
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Usable with 3.0V to 5.5V power/data. Stainless steel tube 6mm diameter by 35mm long. ±0.5°C Accuracy from -10°C to +85°C. Uses 1-Wire interface- requires only one digital pin for communication.
DFRobot DFR0198 DS18B20 Waterproof Digital Temperature Sensor