What do final zeros to the right of decimal point indicate?
&quot;$2.000$&quot; does not mean $2.000 \pm 0.0005$.
&quot;$2.000$&quot; does not mean the interval [1.9995,2.0005].
&quot;2.000&quot; means that there is an unspecified amount of uncertainty in at least the last, and possibly the last two digits.
See the NIST Good Laboratory Practice for Rounding Expanded Uncertainties and Calibration Values:

Example 5
The correction for a weight is computed to be 285.41 mg and the uncertainty is 33.4875 mg.
First, round the uncertainty to two significant figures, that is 33 mg. Then, round the correction
to the same number of decimal places as the uncertainty statement, that is, 285 mg

So in other words, for people who follow the NIST standard of stating uncertainty to two significant digits:
2.000 can mean anything from 1.990-2.010 to 1.901-2.099
Others only express uncertainty using one significant digit, in which case:
2.000 can mean anything from 1.999-2.001 to 1.991-2.009