Understanding Pressure MEMS Technical Information (Relative and Absolute Accuracy)
Calibration of any sensor requires precise control of gain and offset error as well as temperature correction.  This can and is often much more than the incremental resolution and the relative accuracy.

Absolute accuracy> Relative accuracy> resolution depends on the quality of the design in overcoming many factors that contribute to gain , offset and non-linearity.

The same is true for DMM's with 3 digits that might have +/-1 least significant digit (LSD) relative accuracy but maybe +/-2 LSD of offset and 0.1% gain error thus absolute error is the sum of both these. (hypothetical example)