Smart Meter Configuration

I am currently  configuring a smart water meter such that the physical reading should match online reading in the platform.

The readings doesn't match as a result of the last digits which I am estimating which gives difference of 0.1.

The configuration guide book doesn't give the allowable limits. To me, I think the readings should match.  How should I go about it because I need to roll out use of online reading and more so convince customer of this difference.