I ruined my first probe thermometer (yes, it had a silicone jacket) a while back and also got a very poor efficiency since the temp readings were off, but not obviously wrong like they normally do when a probe goes bad. Rather than risk that again I ended up just getting a thermapen for doing mash temp checks.
However, I have a waterproof probe thermometer that I picked up at an aquarium supply store for about $9 I think that works great for monitoring my fermentation temps. It maxes out at 140* though so definitely no good for mashing.
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