done a little reading on this and these guys say a phermonter, I know I didn't spell that right, on a line is the best thing you can have in your boat .

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done a little reading on this and these guys say a phermonter, I know I didn't spell that right, on a line is the best thing you can have in your boat .
how about a pool thermometer. When wally mart or lowes puts out their pool stuff I am gonna pick one up for my rig. The ones I ma thinking of are white too so they may even give you the sechi disc benefit as well when they are lowered into the water.
Before I had a temp gauge on my electronics this is what I did for years. I still use it once and awhile for lower depth checks.
