This temperature sensor communicates over one wire to the microcontroller digitally. It has a measurement range of -55 to 85°C. It’s waterproof and can be used in either air or water. A 1 meter long cable is included with each sensor.
As opposed to analog temperature sensors a digital variant is usually more accurate. It’s not necessary to deal with resistance in the line or external interference. With a digital signal the controller either gets the data as it was sent or it doesn’t get any data.
6 x DS18B20 Waterproof Temperature Probe with 1M Wire