The best unit to use for length is the metre as this is the SI unit. There are a lot of related units that can cover a broad range of lengths, such as the kilometre, metre, centimetre, millimetre, micron, nanometre, angstrom, picometre, femtometre etc.
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Kilometres.Kilometres.Kilometres.Kilometres.
i would use a meter stick
Probably inches or centimeters.
No. Measuring is getting an exact length. Estimating is guessing what the length is
Normal people will use centimetres, but manufacturers and retailers will usually quote millimetres.