When you use near-obsolete measurement units.
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It is rarely, if ever reasonable. If a high level of accuracy is required then a micrometre is better.
you need an object to measure to determine the nearest inch
if your question is explain how to use a ruler to measure to the nearest inch the answer would be...you have to see what inch is the object your measuring to closest to
Yes. When your building a house it doesn't really madder how your measuring.
Go for it! I'm not gonna stop you from measuring to the nearest half inch! This is a bit vague, don't you think?