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Precision is written as a percentage. It tells you how precisely you can use a piece of equipment to take a reading. It is calculated by subtracting the maximum percentage error from 100%. Precision is also applied in a similar way to a set of results or data. You first work out the mean value. Then you take the difference between the lowest and highest result and calculate it as a percentage of the mean value. Subtract that from 100% to find the precision of the experiment.
Precise measurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors which is why it gives no indication of how close the results are to the true value and is not a measure of accuracy.
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