Accuracy

A measurement result is considered accurate if it is judged to be close to the true value. 

Accuracy is how close to the true value a reading is; 

• • precision is a measure of reproducibility - how close together your results are - how much random variation they have; 

  • resolution is the smallest change detectable with your equipment .

Be careful not to confuse accuracy, precision and resolution.

In essence: 

Accuracy: How close you can get to the correct result Precision: How consistently you can get that result