Waterproof 18B20 Temperature Probe Waterproof Stainless Steel
This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so we suggest keeping it under 100°C. Because they are digital, you don't get any signal degradation even over long distances! These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to differentiate them. Usable with 3.0-5.0V systems.
A 4.7K resistor is required as a pullup from the DATA to VCC line when using the sensor.
Both the Dallas Temperature Control Arduino Library and the OneWire Library
Not tested in salt water or corrosive environments
DS18B20 Technical specs: