DS18B20 probes: stainless tip, waterproof cable
Sensor
DS18B20 waterproof probe
The classic stainless-steel waterproof temperature probe on a cable. Temperature only, a few dollars, and it can sit in a brine tank or a glycol bath all year.
The cheapest wired path and the toughest. One data wire plus power and ground; several probes can share a single pin, so one board can watch many points.
Where to get one
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Specs.
| Measures | Temperature only |
|---|---|
| Range | -55 °C to +125 °C; happy in any freezer |
| Accuracy | ±0.5 °C between -10 °C and +85 °C |
| Interface | 1-Wire: several probes share a single data pin on one board |
| Probe | Sealed stainless tip on a waterproof cable; can sit submerged |
| Power | From the board; no batteries |
How to pick a good one.
- Get the sealed stainless-tip version on a cable, not the bare transistor-style part.
- Multi-packs are the value play: the probes chain on one wire, so extras cost you nothing in pins.
- Temperature only. If you also want humidity in the cold room, that is the SHT-30 probe's job.