Replacing thermometer string

You can allow the thermometer to float free, or you can just put it in to check the temp and take it back out. Anything that absorbs water will eventually get moldy. Another option is to re-purpose an old tab floater and put it in there if you're concerned about it getting sucked into the skimmer.
 

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And my friends look puzzled when I know the temp of my pool. They would laugh me out of town if I bought one of those. But, I like to stick my arm in, guess the temp and then squint at the thermometer because my glasses are always inside.
 
Just tie the cord to a piece of pool noodle. Mine is blue, I just cut a slit in it and pushed the cord in and tied it off. Works great floating around and the blue color is subtle so it doesn't stand out too much.
 
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