La precisió es refereix a l'error màxim permès en un entorn d'ús específic. En altres paraules, la precisió s'utilitza per indicar
How close the DMM's measurement is to the actual value of the signal being measured.
Per als DMM, la precisió normalment s'expressa com a percentatge de lectura. Per exemple, el significat de l'1 per cent de precisió de lectura és: quan la pantalla del multímetre digital és d'100.0V, la tensió real pot estar entre 99,0 V i 101,0 V .
Specific values may be added to the basic accuracy in the detailed description. Its meaning is the number of words to be added to transform the rightmost end of the display. In the previous example, the accuracy might be marked as ±(1 percent plus 2). Therefore, if the GMM reads 100.0V, the actual voltage will be between 98.8V and 101.2V.
The accuracy of an analog meter is calculated in terms of full{{0}}scale error, not the displayed reading. The typical accuracy of an analog meter is ±2 percent or ±3 percent of full scale. The typical basic accuracy of a DMM is between ±(0.7 percent plus 1) and ±(0.1 percent plus 1) of reading, or even higher.
