I went for the low tech solution, I just slathered on a bunch of silicone caulking on the probes. They appear to read temp just fine at least good enough for me and so far almost 2 years in usage no rusting, YMMV.1) buy two of the cheap probes. Periodically check the probe your using for corrosion. If you get some or your temps get wonky then replace. Likely you never will have to.
2) buy the cheap probe. Pot the probe and an inch of wire in epoxy. I used a piece of pvc pipe as the mold for the epoxy.
3) by one of the double crimp silicone wire probes. Do nothing but use it and get better temperature accuracy (hopefully). I have no idea where to get it in Europe but it looks like this. https://www.ebay.com/itm/New-DS18b2...2349624.m46890.l49286&mkrid=711-127632-2357-0
4) buy one from theatrus and know you are getting an accurate probe with long lasting corrosion protection.