Use a tape measure and measure in metres. For greater precision, measure in centimetres.
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cm
depends on what item you are measuring
Tape measure and centimetre.
a ruler is the measuring tool. The type of unit you will use is cm and mm
A caliper is a tool used to measure distances (small ones typically). It is not a unit of measure. Your question is like asking how many feet are in tape measure or how many pounds are in a scale.