I have two YSI thermistors for my digitec 5810s that, when placed in a container of water, read the same temperature exactly (they are 0.01C res) over the 25-35C water temperature range. Since this is the case, I find the delta T across the waterblock to be useful to me when setting up the loop and playing around with my gear. I like to watch the change in delta T with flow rate; they are bright red LEDs and it's something to do for the testing period (which takes a long time). I don't buy my stuff retail because I don't have a closet full of money. I don't see why the private checks I do to get a feel for how the testing is going has become such a big deal.
The CPU die and the wb baseplate I both take with a small diameter type T thermistor. The difference between CPU die temp and the baseplate temp gives me an idea of the "goodness" of waterblock mounting. I don't see why measuring temperatures at both sides of all the junctions would be a bad thing? It isn't any extra work on my part and is sometimes useful.
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