English to Greek Medical Medical: Instruments

Context:
Evaluation of precision and exactitude is done for every instrument.

Precision
Mean dispensation [mg], 1 µl = 1 mg, standard deviation and coefficient of variation was calculated from values of eleven instruments with three dispensations of each volume.

Exactitude
Deviation was calculated:
target dispensation - mean dispensation
% deviation was calculated:
(deviation *100)/ target dispensation

The document is a manual for an IVD device. Not sure how to distinguish precision from exactitude, thanks for the help!