You want my honest truth about thermometers?
Forget going digital, or getting a dial, or another floating brew thermometer (I've killed them all) even the water proof digital ones, or the digital ones I've MADE waterproof from tutorials on here.
Just get yourself a couple long glass scientific ones (I think mine cost 10 bucks)
Like this
Seriously, many of us go through thermometers faster than we change our underwear...
https://www.homebrewtalk.com/f11/they-all-lie-thermometers-evil-rant-83007/
https://www.homebrewtalk.com/f11/thermometers-i-must-cursed-91147/
So far the most accurate, long enough to use, can be held in the brewpot with a wire coathanger, is the above mentioned glass one.
The second best I have found is those small dial therms in most grocery stores, like this;
Except at 6 inches long, they are pretty short....
I have found that the larger dial ones, and most digital, that even if the probe or probe wire is waterproof...the dial or readout is usually not steamproof....and steam gets in, condenses inside the dial, or the screen, and eventually ruins the thermometer.
Like I said, I've killed or broken just about every thermometer possible....and although the long one is glass, and therefore should be breakable, it is pretty rugged....
Good luck.