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In real life measurements, there are always errors because of equipment inaccuracy, limitation of the measuring process, human error, etc etc. So no measurement can be considered pin point correct. In most scientific and technical measures, there is a range around which a measure might be.
One common way to express this is to give the most central or likely measure and a range, called the margin of error. An example would be measuring the length of something and saying that it is 1m +/- 1cm. This means that something is very likely between 99cm and 101cm long. This the margin of error. It is also common for that to be expressed in percentages.
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