DS18B20 Waterproof Temperature Sensor Probe

This is the same DS18B20 digital sensor used in countless temperature projects, but sealed inside a stainless-steel probe tip and run out on a cable so it can be submerged directly in water, buried in soil, or dropped into a tank without the sensor's electronics ever getting wet. That makes it the practical choice for aquarium temperature monitors, hydroponic and greenhouse systems, hot water tank gauges, and outdoor weather stations, anywhere a bare PCB sensor would corrode or fail within days of exposure to moisture. It still speaks the same single-wire digital protocol as the standard DS18B20, so existing 1-Wire libraries and multi-sensor daisy-chaining work exactly the same way, the only difference is that this version can actually survive living in the liquid it is measuring.