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.
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Millimetre.
if large,pints if small,ounces if medium,cups
inches because there small enough
There are many units which are used to measure the lengths of the object . The smallest unit of length is fero meter.
You can use cups to measure a small can of juice.