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A steel measuring tape will give an accuracy to within a millimeter. A laser 'gun' can also be used, but one that is more accurate than a normal measuring tape is rather expensive.
It is to different things. A meter is a measurment of length and kilogram is measuring weight
"more than" means greater than (for example: 2 is more than 1 or 2 > 1). Both are true statements. "longer" means greater in length (for example: if a line is 2 units in length than a line 2.1 units in length is "longer" than the first line length.)