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A caliper is more accurate.
There are 100 centimeters in a meter. The second student (y) would be more accurate.
the accurate mesurements for a ruler is 12 inches or 1 foot
It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
Make sure you are using the correct SI unit on the ruler.