thermocouples have more than decimal accuracy, its the measuring hardware thats problematic.
Im not so sure about flows sensors (which is what you might be talking about). A standard liquid in glass manometer could of an accuracy of greater than that, but mechanical stuff is problematic as small changes are going to effect things.
Tubing and plumbing will create losses which will effect your measurements of dp for the block as it will measure dp for the entire system (including tubing and fittings.)
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