where to put a water temp sensor?

[NaeKuh]

MArtin was the one who gave me the best suggestion,

Right before the block, because that's the temp. water I'm cooling with. So for my bench, it's between the rad and block, and works very well like that.

andyc

yeah but andy depending on what you have on the loop, the water temp wont rise more then 1-2C from inlet to outlet. Martin's little dualcore couldnt even put a dent in his radiator.

Now if your snyxx [PS you saved me a TON of hours on your GPU discovery ] and have a Quad and GTX FullCover on it, then yeah, your inlet to outlet will have a slightly larger delta...

but i dont think it really matters, if your considering a temp probe, it would mean your already went dual loops :P.
I personally would put it where its the most convenient.