Resolution, Precision, Accuracy

Some measuring devices, like atomic clocks can be very precise and very accurate.

While in everyday speech, precision and accuracy may be thought to be the same thing, they're really quite different. And the distinction is important.

• Precision indicates a measuring system's ability to always give the same reading when measuring the same thing.
• Accuracy is the closeness of the agreement between the result of a measurement and a true value of the measurand. It depends on the degree to which the readings of the instrument agree to the readings of the accepted standard.

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