Thanks Matt....I'm thinking the same way. When I picked this RKL up the probe not only was totally dry.....and that way for months, but also totally encrusted with dead coralline....including up over the top, onto the wire. This told me that it was totally submerged.
So I gave it a good soak and wash in vinegar, rinsed it off, and out of curiosity, and expecting failure, put it into my current tank. 78 degrees on the nose, same as my thermistor probe I've had for years.