On Tue, 24 Nov 2009 21:31:05 -0800, "Steve B"
wrote:

FYI, upon Googling quite a bit this afternoon, I did discover that a
"Clinefinder" is rated very very highly by anyone who owns one. It is a
device that very accurately reads temperatures. Quite simple, on a reel, a
cord, a weight, a sensor, and an aa battery. At the transition of a
thermocline, there is also a radical transition in oxygen levels, so just
finding a thermocline will put you in an oxygen level striation. The
troubles are two: they are $140 each, and only have 50' cables. People
rating them good was four out of five. Nonetheless, I do believe I will be
getting one for crappie fishing.

I trust my Raymarine DS-600 to find thermoclines - in comparing
results against a temperature probe (I have a mechanical thermometer
on old broken rod and spinning reel), I find it's very accurate by
comparison.

Owner reviews for ALL oxygen sensors related to fishing were very low, from
poor quality to big swings in readings. People rating them good were one

Agreed and from personal experience, they suck. :)