I've attached two DS1820 temp sensors as pics below(below black tape) to measure temp of in and out coming water from cooler.
Click image for larger version. 

Name:	P1160799.jpg 
Views:	10009 
Size:	436.8 KB 
ID:	3868
That's a water temp readout shown in 0,1C.
Top line- Outlet
Lower line-Inlet
While pics below taken CPU temp - 42C
Click image for larger version. 

Name:	P1160802.jpg 
Views:	855 
Size:	396.4 KB 
ID:	3869