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Because otherwise you will get inaccurate results. But it is best before you start to work out how accurately you need each value you are going to measure. For example if you are going to measure three variables, and they all have a similar effect on the result, it is no use measuring two very accurately if the other one can't be measured to the same accuracy. This is the principle of combining errors, each measured quantity should have a similar percentage error ideally. You might purchase some very expensive equipment to measure one thing, but it would be a waste if other things are not measured to the same accuracy, so take a bit of time to think this out before you start.

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