The “accuracy” of a measuring instrument is determined

1. closeness of the value indicated by it to the correct value of the measurand
2. repeatability of the measured value
3. speed with which the instruments’s reading approaches the final value
4. least change in the value of the measurand that could be detected by the instrument

The “accuracy” of measuring instrument is determined by the closeness of the value indicated by it to the correct value of the measurand.