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The answers to this question are not exact, but are real and proper.

The True Value of a measurement is the value to which a large number of observations; by different observers and different methods; tend.

Accuracy is the closeness to which this measurement comes to the true value.

Sensitivity of measurement is the finest discrimination it can measure. But sensitive measurements are often 'noisy' = erratic.

Resolution is the number of digits in the result. Often quite a spurious representation of the True Value, and often mistaken for accuracy.

Consider for example the height of Mt Everest. Or your own weight.

The ASTM (in USA) and the various Standards Organizations will have very similar definitions.

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