Teddxn,
Welcome to the forums. We have a nice bunch of trout guys here who are willing to share info.
Phishan showed me a gadget once that measures the thermocline. Basically it was a probe that you would reel down from it's casing to find the temperature at different levels. I'm still hoping to find one at a decent price for myself but it seems to be pretty unique.
I'm still mainly a bass guy but I'm getting good experience and info on trout from some of the guys on the forum. Stick around.
Best Always,
Vinny