easiest/best ways of getting acurate water temps in a little deeper water 10'-20', not surface temp?

Electric temp probe is the only way I know of .

Catch a bass and put a digital temp probe down it's throat,body temp is the same as the water temp it came out of.

You can purchase temp probes with up to 50' of wire leads. Mark the leads every 5' with water proof tape, add a 2 oz weight and lower the probe to whatever depth you want to measure. 

The bass method is a lot more fun and easier!

Tom

Hey Tom, What if I haven't caught one yet? Can I do the same thing to my cold hearted fishing partner? How long would I have to keep him submerged?

1 hour ago, papajoe222 said:

Hey Tom, What if I haven't caught one yet? Can I do the same thing to my cold hearted fishing partner? How long would I have to keep him submerged?

Hand him the anchor and a temp probe.

Tom