Here's a creative one for all those with unique ideas:

I have a standard pencil-like pool thermometer tied to a string on the ladder.

Problem: It floats. What can I tape, tie, attach, melt, weld or glue to it to make the bottom sink?

Solution: ?

Ideas:
- Electrical Tape, 3 pennies
- Drill and put in a bolt
- Attach a car tire
- buy a new thermometer (but for the inventive sake - NO!)

Any good/cool/crazy ideas?

Cheers.