Water Temperature Probe

i am needing a water temperature probe to monitor the water temp in my 5 bucket DWC. any suggestions or advice. I really don't want to have to spend a lot of money for a fancy unit. if i can find them for 15 buck or so i will buy 5 and run with it.

Smokey

Look in under, "Fish pond temperature gauge". There's some with probes for $15. Most of the aquarium type stuff has what you need. Hydroponics and aquariums are close to the same thing.