Use dry measure measuring cup.
a millimeter
You must first decide what you want to measure about the rice grains: their length, circumference, mass, weight, volume, color, elasticity, etc.
A balance.
use scale
Units of measurement are useful to rationally measure anything.
you would use a kilogram
use a tape measure or some form of measurement to measure you ;]
inches
cm
a meter
Joules
To measure water for rice accurately, use a 1:2 ratio of rice to water. For example, if you are cooking 1 cup of rice, use 2 cups of water. This ensures the rice cooks properly and isn't too dry or too mushy.