A scale
kilograms.
gram
newton
The Newton
Mass is measured in kilograms.
milli-gram
The metric unit for measuring human weight is actually the Newton (N). Newton's are a measure of force and weight is the product of the acceleration of gravity and an objects mass. The metric unit for measuring human mass is the kilogram (kg).
The weight of the box would be measured in grams.
Grams
A gram would be an appropriate measure for its mass.
the best answer from me you can get is i would have to say measure it by pounds
liters