always the meter to measure length. This is an SI (international) unit of measurment, and is the standard international unit of measurment for length.
A "length" is not a standard unit of measure.
Well the SI unit of length is the meter, and SI is the first standard measurement system...
Metre.
Inches and feet measure length in standard units, in metric meters and centimeters measure length.
Centimeter
If the specimen you are trying to measure is shorter than the standard, you can use a different unit. After the measurement is completed, you can convert to the standard unit.
Meter or Metre depending on how your county spells it.
The meter is the standard SI unit of length. ( kilometers when longer distances are talked about )
Standard unit of length
The meter is the standard unit of measurement for length in the SI system.
the least unit to measure the length is fermo meter .