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.
Probably inches or centimeters.
i would use a meter stick
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.