It should be okay to fix it. I know it's not necessary, but I am in love with my temp gun. For $35 or less you can't really go wrong, all you'd have to do it open the tank and point the temp gun and know what the temps are, without wondering if your probe moved...which is probably did lol.. Here's the site I bought mine from if your interested, I have seen them on ebay cheaper. It's the PE-2.
http://tempgun.com/