The short answer
The probe itself, the metal stem and tip, is made to get wet and get hot. It goes inside meat, in smokers, and in fryers. What can't get soaked is the joint where the probe's cable meets the handle, or on wireless units, the body that houses the electronics.
Waterproof versus water-resistant
Check the rating before you assume anything. A fully waterproof probe can be submerged. Water-resistant means splashes and rain are fine, but a soak in the sink will find the seam. Most BBQ probe manufacturers publish the rating; if they don't, assume splashes only.
How to clean probes the right way
- Wipe first, wash second. Get the grease off the stem with a paper towel while it's still warm. Warm grease wipes off in one pass; cold grease needs scrubbing.
- Hand wash the probe shaft only. Hot soapy water on the metal stem and the first few inches of cable. Keep the connector and any display unit away from the faucet entirely.
- Never the dishwasher. Even on "waterproof" models, dishwashers combine prolonged heat, detergent, and high-pressure spray at the cable joint. That's where they leak.
- Dry fully before storing. Moisture left in the cable weave wicks toward the connector over time and corrodes it. Air dry or towel dry the full length of cable, then coil loosely.
Care habits that keep probes accurate
- Don't kink the cable. The wires inside break at kink points. Coil it in a wide loop, like a garden hose you want to use again next weekend.
- Don't exceed the temp rating. Probe stems handle meat temperatures fine; the cables usually top out around 482°F. Direct flame contact or resting a cable on the firebox will melt the insulation.
- Close the lid gently. Pinching a cable in the smoker lid, hard, every cook fatigues the internal wires. Sit it in the grommet slot if your smoker has one.
- Calibrate twice a season. Ice-water test: 32°F within a degree. Drifted probes ruin cooks quietly.
When to replace
Erratic readings, intermittent signal, and visible fraying at the joint are all end-of-life signs. Probes are consumables, like brake pads. Buying a unit with replaceable probes is the single best purchasing decision you can make, because the probes will die long before the display does.