Check the listing for details. Waterproof 1-Wire DS18B20 Digital temperature sensor #381. Condition: New. Listed at 8.00 USD. This is a pre-wired and waterproofed (with heat shrink) version of a 1 Wire DS18B20 sensor. 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!