One Wire Digital Temperature Sensor - DS18B20

Can be powered from data line. Power supply range is 3.0V to 5.5V

Requires no external components

Measures temperatures from -55°C to 125°C (-67°F to 257°F)

±0.5°C accuracy from -10°C to 85°C

Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

This is the latest DS18B20 1-Wire digital temperature sensor from Maxim IC. Reports degrees C with 9 to 12-bit precision, -55C to 125C (/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus. This is a wonderful part that is the corner stone of many data-logging and temperature control projects.
Brand: SparkFun, Model: DS18B20