Bill- After checking Wal Mart, Meijers, ACO, True Value, Lowes, 4 other independent hardware/home centers and the Northern and Cabelas catalogues all the digital temp. gauges I located had a 10' probe. I'll keep looking but if I splice another 10' wire (of the same size and type)into the existing wire would that affect the reading? I don't know if additional resistance would be aproblem or not.
I printed up a small chart with visibility, surface thru 18 feet lines and total water depth so I can just fill in the blanks.
I'll try the 1st. and 15th. of June, July and Aug. and we'll see what the readings are.

Mistakes are proof that you are trying.


Dan