What is the limit of accurately of the meter ruler?

Answer 1

Generally speaking, the limit of accuracy of any measuring device is 1/2 of the smallest marked increment. So, on a typical meter stick, you would have millimeter hash-marks, so the limit is 1/2 of a millimeter.

However, one must be careful with this statement because how a measuring device is constructed, to what tolerances, and how it is used would affect the measurement.

For example, if the temperature changes, the meter stick would change, and thus affect the measurement. If the end is worn, if there is human error, if one does not account for parallax, etc., then the error will be greater.