I believe the wired indoor/outdoor thermometers have a 10' cable on them.

Or maybe look at a fishing thermometer?

A pool thermometer would work, just pull it up fast to read it.


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).