Newton's Law
F = m * a
Force is a product of mass and acceleration
Weight is a special case of Newton's Laws
W = m * g
Weight is a product of mass and the acceleration due to gravity.
Weight, W, is in Newtons (N)
mass, m, is in kilograms (kg)
g = 9.81 m/s²
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I suggest the millinewton. However, please note that people commonly confuse weight and mass; if it is actually the mass you want to measure, then use the gram.
weight and mass measures the volume
To measure weight, a scale. To measure mass, a balance.
Kilogram is a measure of mass but in common parlance "weight" is used to mean "mass" therefore one would normally use the kilogram. The difference between weight and mass is only important when you need to be scientifically rigorous. Then you would use Newtons which is the scientifically correct unit of weight.
Weight is a measure of the gravitational pull for a mass , such that a mass of 1 Kg is having a weight of 10 Newton . So weight is a downward force measured in Newtons . Weight ( in N ) = Mass ( in Kg ) × Gravity ( usually 10N/Kg )