harej-NIOSH added a comment. @kaldari captures it well. Measurements have inherent uncertainty, since measurement instruments such as scales can only measure out to so many decimal places. So if a scale tells you something has 3.24 grams of mass, it could be 3.239 or 3.241, but the scale cannot measure at that level of precision, so it rounds. I would say that anything that is a measurement should have a default uncertainty of what the last decimal point is (for my example +/- 0.01). An option to override would be appropriate, of course.
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