Grammes or ounces.
But ...
Technically these are measures of mass and not weight. A Millinewton would be the SI unit corresponding to a mass of 1 gram. Don't know what the ounce would give but the weight corrsponding to a mass of 1 pound on the surface of the earth is a poundal.
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pounds
Newtons.
Try grams
kilo-newtons.
grams