Depending how small it is, you could use the meter, the millimeter, the micron (= micrometer), the nanometer, etc. The meter is approximately the height of a child; the millimeter is 1/1000 of that, the micron is a millionth of a meter, the nanometer is a billionth of a meter.
Millimetre.
if large,pints if small,ounces if medium,cups
There are many units which are used to measure the lengths of the object . The smallest unit of length is fero meter.
inches because there small enough
You can use cups to measure a small can of juice.
to measure a small trashcan
Lengths are measured in meters.
Milliliters.
Assuming you want to measure lengths, meters are commonly used.
inches
Millimetre.
if large,pints if small,ounces if medium,cups
There are many units which are used to measure the lengths of the object . The smallest unit of length is fero meter.
inches because there small enough
Due to their small size, you would use millimeters to measure the length of an ant.
Many units are used to measure volume; in SI, the basic unit would be cubic meters, since lengths are measured in meters.
Inches or Centimeters would be small enough to measure a teacup.