Marchen,
While there are many devices that have temperature probes, you have to consider this. If you put a probe inside of a rack, you are measuring at the closest part of a single device; and not necessarily the hotest part of that device. If all you want to do is, then a general probe on the output is a good choice.
The most usable method you should consider is a way to do ambient monitoring to monitor at a row level in the are of the racks you would like to monitor. For me, if a server is pumping out 110 degree air, I want to know how it impacts the racks around it.
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