Accuracy and Precision Accuracy and Precision Accuracy indicates how close a measurement is to the accepted value. For example, we'd expect a balance to read 100 grams if we placed a standard 100 g weight on the balance. If it does not, then the balance is inaccurate.
Precision indicates how close together or how repeatable the results are.
A precise measuring instrument will give very nearly the same result each time it is used. There are several ways to report the precision of results. A better way, but one that requires statistical analysis would be to report the standard deviation . 100.00 Range 0.01 Std. Both accuracy and precision affect how many significant digits can be reported .