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Preciseness is a measure of a machine's ability to repeatedly give results close to the ones it's already given. For example, a pH test may read 6.5, 6.6, 6.5, 6.5, 6.5, 6.6, and be considered pretty precise.

Accuracy is a measure of a machine's ability to give a result as close as possible to the real measurement. For instance, if the solution the pH meter was measuring is really6.8, and the machine reads 6.8, the machine is considered accurate.

So, a machine could be accurate by giving a result very near to the actual real value, but be imprecise by giving values that ranged by a relatively large amount from trial to trial.

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14y ago

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