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A specification tolerance is different from a measurement uncertainty. For example, if you have a rod that must fit into a hole, you'd better make sure that the rod will be at least no larger than the hole, so you specify a maximum size for the rod, but allow it to be smaller than that, and a minimum size for the hole, and let it be larger than that. The requirement is obviously that you can get the rod into the hole ant that it won't wobble once fitted.
This reminds me of specification in mechanical drawings I've seen (and
written), e.g. 2.010 " +0, -.002 Why not 2.009 +/- 0.001? No
idea. In my case it musta been having written 2.010, not wanting to
cross out after discovering what I later wanted, or 2.010 is ideal but
no more and 2.008 is OK?????