It's a 1 meter black DS18B20 Waterproof Temperature Probe. It is a 1-wire digital temperature sensor. This is fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard DAC.
Specifications:
| Supply Voltage | 3.0 – 5.5V |
| Temperature range | -55°C ~ +125°C |
| Probe diameter | 6 mm |
| Probe length | 50 mm |
| Resolution | 9 ~ 12 bit |
| Query time | 750 msec |
| Country of Origin | China |
